Yes, a roller cam from a Mustang HO 302 will slip right in. I have a '95 roller block in a '92 F150 shortbed, and I have a mild Crane Cam 212in/222ex .493in/510 ex and the power is amazing. If you can find a donor motor like I did(from a wrecked '95 F150 4X4), it comes with a decent roller cam already in it, but the big part is that it comes with the complete roller setup, roller lifters, roler lifter guides, roller spider, etc. I am running mass air, and the truck is a total sleeper. I now have a Crane Compucam 2030, which I am going to install in September, which has more intake duration, and has higher lift, .533in/.544ex. A 351 can take a lot more cam than a 302, and still remain very well mannered for the street.