best size 2bbl carb or small 4 bbl for my 318?

i mean... i'll not argue a side for or against.
Probably cause we're stupid?
Do I need to go find my I'm with stupid shirt?
Anyway my 318 vote is stock manifolds, Summit/Kegs duel exhaust kit. AFB or AVS 500cfm 4bbl on a duel plane will give mileage