big horse power needs big tire mostly and small tires for low horse power. the bigger the tire the more drag down track you have and slower et.s, if you can hook a small tire your going to run faster ,if not or the tracks you run are marginal go as big as you can
I run a 4.10 gear in my 850 hp front engine dragster with a 12x33x15 slick. My NOVA runs a 4.88 with 450 hp on a 9x30.15 tslick. NOVA weight 2680, dragster 1800 lbs.