[347]

I am running a tremec 3550 with 4.1 rear end
1st is short,its over in a heartbeat,second is over in 2 heart beats
at 66mph in 5th 2500rpm with 26inch wheels

I am running a 347 with a 248@.050 cam power range around 3000plus

I would say go for the 4.1's,they will give awsome acceloration,its very very cheap power
but maybe you dont need to keep your engine rev's up!