I ran a Clifford 264 in a 235 with a 3spd and 3:55 it my truck the first time around. I didn't really like it much overall. I had to slip the clutch a little on takeoff, and the performance was blaaah when going from 2nd into 3rd. I put in a 4:11 and that helped (4:11's can hide alot of sins), but of course, it had no top end anymore. I put the 3:55's back in and got a T5 from an S10. That was the best solution, allthough one with a 3.50 first would be better than the 4.03 like I was using.
If you are set on using a 3spd and 3:55's, you will be better off with the 254* cam or something similar. If you're not going to wind her up much past 3500, then you won't get much out of a larger cam anyway, except for the rumpy sound. If you can't stand the idea of running the stock cam and you just gotta have something different, then the 254, M4F, or stock 261 style cam would be my recommendation. It's real easy to overcam these things. Under 3000 rpms you really don't need to do anything more than that.
