Any cam that you can get in there that won't fuck with the speed density probably wouldn't be worth the time and money installing it. I'd just do roller rockers if I was you or convert it to mass air and cam it. Even then, your not going to get a real noticeable difference from a cam without better flowing heads.

I'd say you could get a b cam in there without having problems, but what happens if the computer just can't handle it? Your gonna be stuck with a shitty running car until you can get it converted to mass air.