Which Vintage Head, and Why??

Linc is absolutely right on the cylinder head. I'm doing almost everything he listed for my '64 225. I just got my cylinder head back from the shop. Ported, planed .100 with EngnBldr valves and hardened seats. Can't wait to get it on my engine. I also bought an Erson cam for further down the road. A big thing to remember when building up a six is to get a good stall converter, or you're going to waste a lot of effort. A good custom one will run about $400, but well worth it.

As for cylinder head vintage, I've heard it doesn't matter that much. I'm doing a drool tube version but other than a slight weight variation, I would say the difference is negligible.