300 head onto a 200 bottom

Probably dumb question but as a developement of the 200, will a 300 head fit to a 200 lower.... only I have a knackerd 300 (No1 big end bearing and buggered crankshaft) and a dubious 200 (out of a disco, doesnt idle but runs ok) to play with to make one good engine...

If not when fitting the 200 will I have to change the air intake over from right to left to or can i bodge the three hundred intake?

Anyone know where to get a spanner to undo the viscous coupling on the fan? Will have to make my own out of some sheet steel otherwise.

you can get the spanner from ebay

just get an old spanner that fits and grind it down