Hey guys I have a 1974 Plymouth Valiant 4 Door. alot of things were changed on this car. It has a 1972 360 HP engine in it with a small cam and some mild porting of the stock heads. Also it has a a-904 trans with a 8.25 rear end. The car goes good for what it is. Im not sure what rear end gear to get for running around the street and possibly the highway once in a while. I was thinking 3.90's but i think it might be too much for the street.

thanks alot

Vin  

I think your probably right 3.90's are probably too tall. It all depends on how tall your rear tire is.
If you are running a 26" tire 3.55 gears would be a good set up.
If you have a 28" tire, [not likely] then a 3.90 would be a good choice.  

I have a 360 in a challenger with a 904 and have an 8-3/4 rear with a 391 posi.I can drive it anywhere but it pegs 3000 rpm at 60 mph.