Need some advice on choosing an engine

When building a fun street engine the difference between starting from a 383 or 400 is minimal. Yes 400 bore is bigger and always gonna be worth 20 cid if both built with same stroke. But 383 bore is far from small and really what's gonna change in a under 600 hp engine. Hp will be practically the same and about 20-30 lbs-ft more for the 400 which is about the same as adding 0.15:1 more rear gear. Same argument could be used for 340 over 360 even thought gains would be slightly less but 360 is the main stroked sbm because it's more available and cheaper even though it gives up a few lbs-ft and cfm of breathing room.