3" exhaust? 2.5" exhaust...??

**Sorry for the typo in the title; fat fingers, small keys.

Has anyone done and comparison of a 3" vs 2.5" exhaust on a mild stock stroke small block?

For reference: stock stroke 360, kb107, EQ magnum heads, mid 240 degree (@ .050) cam. In a 69 orig slant six Dart.

Discuss...