You need an adapter plate like this one. They do come up from time to time on various auction sites You will also need new engine mounts

Just a suggestion - I had this same problem and for ages I also thought it was fuel related. I even ditched the Efi and went to carbs it got so frustrating. Classic Kev might be on the right lines a I eventually changed the Dizzy and that did the trick. On looking at the old Dizzy two things...

Really - how come? Completely dead?

Strombys or SUs? if HIF/HD SUs could be worn/sticky piston not returning to the deck or not rising when it starts, sticky needle jamming in the jet until the pedal is pushed?

250bhp! A standard 4.6 was reputably up to 220bhp (peak) with 290lb/ft torque. The same 4.6 uprated with wilder cams might push 260bhp depending on mods so I think you are thinking a little higher than achievable without some wads dosh. Having said that the R380 is strong enough as is the...

Could be a few things - does it happen if work the accelerator once before you start it?

Should be a book on that somewhere - I had to do loads of research and testing to get anywhere near for SUs on my 3.9. There was a little program by Scot Bevis called WinSU but I don't think he's upgraded it to run on Win8

RR Efi should fit - the pedal end is a clevis and pin on both so it's the other end that is different. I think the efi has a longer cable length between the adjuster and the clevis. On a Series you have to make one up as the whole throttle pedal is completely different with rods and levers

I prefer carbs (but not those Strombys) - less to go wrong unless there's a megasquirt on it.

I don't use one back to the tank - there is a float valve on SUs (HS6s anyway) which comes up when it the chamber fills and stops any more fuel getting in, but if the float valve sticks open it worth knowing so I leave the return either off or to a pipe that drops to the ground. Petrol in the...

And. The feed from the tank will have a filter. The return doesn't need it - not sure what you mean by 'feed' from LH carb though

Assuming you have SU HIF6 (you don't say which) then it isn't hard to sort them out but it does take time. Balancing them can be done with a tube - remove the air filters and place a tube close to the air intake and listen to the hiss through the other end. Do this on the other carb and aim to...

Do you mean on the brass fuel inlet pipe?. I believe this is a push fit.

Huh! Never thought of that - Good find

With the rocker cover off does no2 rockers move the same distance as the others when turned by hand?

125 seems fair enough, even bordering on good and if you have a good spark that leaves the valves - is cam in good condition. One end of the cam (can;t remember which) suffers from lack of oil and can wear - maybe not lifting the exhaust valve enough? Other option could be valve guide has gone...

Doesn't really answer the question though - I have twin filters on the SUs and they haven't sucked water yet as they are high up but there is always that one time. I looked at a normal barrel filter box with some flexi pipe out to the roll cage. Got the parts somewhere but never fitted it...

Several things it could be. If it's been standing the carbs may have gummed up, the floats are not rising fully causing fuel to return to the tank (does pinching the return pipe see fuel into the carb throat), the jet isn't rising (check the pistons can rise and fall) I'm assuming you have SU...

Whatever happened to Doc Evil?

Really? Didn't know that. Thought efi produced more grunt than carbs but I'm no expert