My advice build what you can afford to finish momenteum quickly drops off and everything starts to become I'll do that tomorrow , there again its probably only me.
My rule of thumb...for every hour of disassembly, a day of assembly is incurred running down replacement parts, cleaning, documenting what I did, and installing.
Based on posts I have read here, as well as other member posts, it doesn't seem there is a need to purchase after market heads for performance.
It seems to me there are several factors one considers when purchasing heads, each based with different priorities based on owner/builder tastes/$$$.
**There is the wow factor...which almost got me to fork over big $$$ for a beautiful shiny pair of aftermarket heads.
**There is the price/availability factor...I found a 71 351C block with 4v quench heads, crank and stock manifold(none touched from stock) for $450. If my car wasn't a 302, but a 351C 2V, I probably would have just used that, unless I got a cheap pair of 4v quench heads.
**There is the performance factor... and several posts indicate they have 2V heads that perform at least as well as 4V.
**There is the vintage factor...I like to use stock, limited availability parts where possible for bragging(I know that is hard to believe).
**There is the pump gas factor...here you have to decide who to believe. I was convinced quench heads will run better on pump gas then open chamber.
Any other factors?
You guys that run 2V, do you increase your valve diameter to match the 4V, or do you leave that alone? My book indicates on intake, 2v= 2.040 4V= 2.191, exhaust 2V=1.665, 4v=1.710. On the surface, doesn't look like much of a difference.