In an A-body with that combo you could get away with 3.73's since you plan to drive it alot. You can always play with tire sizes also. I would say 4.10's but unless you modify the wheelwell you cant get a very tall tire on an A-body. I run 4.30's but I dont have near the power you do so I need the gear and I use a 30" tall tire on my B-body to help keep the RPM's down. My son uses 3.91's in his Dart and he cant fit no taller then a 28" tire which still rubs some. If you cant fit taller then a 28" tire I would go with the 3.73's as you will have enough power at the track to get away with them. Ron