well if you are going to stroke a 318 why not stroke the 360 up to 412 ci , you can go bigger but you need an aftermarket block to do it so it would depend on your budget
I would use ported 308 casting producion heads or step up to the W2 Mopar heads but W2 has no intake for the 6 pack , IMO the eddy heads are not better than the Production 308 castings & I do not know of another good small block head . The W2 will make far more power than the Eddys or any production head but they need special headers inatke , rockers & pushrods etc to work