Is building a stroked 318 better than a stroked 340/360?

I almost bought a C5 Vette when shopping for my Valiant, for it general all around street performance/handling, it would take a lot for my Valiant to be on par especially after few mods to the Vette.
Let's face it, anything over 350 - 400hp is disproportionate to the handling of the car anyway.