You might want to do some homework on the engine mounts if you are doing a 318 now and a 340 later. I believe they are different from a 273/318 and 340/360, so the 340 would need another set.
What he needs is a set of V8 engine mounts from a 64-66 A body, then he will need to modify the drivers side with a small triangle piece and he should be all set.