318: too much cylinder head?

Never to big, here is Aus we have GM 308 with 4.00 bore & 3.06 stroke and you can get big HP out of them - they rev like buggery. Big heads, Massive Cam, 750+ carb and run in the 11s & 12s. The only advantage it has over the 318 is a larger bore so you can get bigger valves in there. The Mopar job is alot better IMO as the bottom end is better & is made to try rev - just look at the rods 6.123 is great....Hmm think I've side tracked myself - if we can do it on these engines, the 318 will be just fine is what I'm trying to say