do i need need a bigger carb

Runs 4.10 gears, 275/50 tire, 4000 stall. 60 foots are consistent low 1.6's.last time I checked plugs I was running octane booster so it made it hard to read but I do run an afr gauge which said I could go slightly richer, I haven't stopped makin mph yet, timing is 32 total
Car weighs aRound 3500lb