Those heads won't have 'hardened valve seats', you might want to factor that into your calculations.
If you go with later heads that have the accessory bolt holes then you'll need to go with a long waterpump & pulleys etc to use the newer bracketry.

If you want to get stupid with oldschool trick heads, I have a pristine set of 292 heads I'd cut loose for a price.

A shop is where you wash your hands before you pee.