1997 4.6 engine swap from hell please help

This is turning out to be the engine swap from hell. ive now replaced all the plugs leads and its not firing on the o/s bank not even 1 of them I have a spark going to all four plugs on that side as but i still have my misfire. coil pack maybe? could it be the injector wiring which to be honest i guessed them as i couldnt remeber how they went? or does anyone think the engine i got could be a dud? Ive had engine from this previous breakers before and they assured me this engine ran ok before they removed it. any ideas would be great

check fuel pressure at the fuel rail!!!

check plug order!!!

check crank and cam sensors are located correctly and crank sensor is not touching the back(i.e air gap is correct)

take cam sensor out and check for damage ( use the one off your old engine as you knew this worked)

try getting it on the obd reader see if there is anything it can tell you.

make sure the two connections on the top of the intake manifold are on secure, one's a single wire, the other is the same as an injector plug.

i found the the injector wires only fit one injector if you lay them in a comfortable pattern except the multi plug mentioned before could be confused with the first injector.

check all the plugs are on the air intake tube, there is also a little (vac???) plug that goes to a unit bolted near/on the top of the suspension/shock absorber strut, beneath the intake tube.

make sure the temp sensor is connected on the airbox.

check the plugs behind the pass side bank are connected correctly and not damaged, it is possible to connect this one to another plug and it will not fire no matter what happens (this caught me out once)

dunno what else to suggest!!

thanks gav gave my mate a print out of what you said but now its running on 8 it ticks over fine but when you try to rev it it misfires slightly and wont rev? as well as it sounds like its sucking air from in the engine bay? please people any ideas dont care how strange they might seem.

my knowledge on these lumps is non-existent, but some peeps have commented before on leaky inlet manifolds?

try the maf senser, let it warm up then unolug it and try to rev