Potential? You have to remember that the original Wayne heads were designed for the 216 Chevy with no oil pressure to the rods. All of these engines have their unique niches and all have potential. The question is only what you want and will your engine do that for a reasonable investment. A built 228 will not make the power that a built 302 will and will likely cost bout the same. But a good running 228 with duel carbs, a split manifold. and a good cam could be a fun street engine. 228s are cheaper and easier to find than 302s. A 228 might make a good supercharged or turbo project. That may make up for some inches.