Well the truck blocks came with the roller cams in 94, both 302 and 351's. I'm not sure what year they started with the 302, but I know it was 94 for the 351. The cams are not performance at all. I've been running the E303, but I just changed to to the F303. The Ford Motorsports cams. If you go with a 351, go for the gusto, stroke it. Building a 393 from a 351W, it uses a 3.85 stroke crank, 351W rods, and late model 302 or 5.0 pistons. On eBay, you can get the crank for $150, the pistons , from $200 and up, depending on what your looking for. Or you can get a complete kit fairly resonable. The one thing to keep in mind, is that the 302 piston that you use, will be around 1.6 to 1 higher compression in a 393. I thought I was running 9.9 , and they turned out to be 11.5. It sounded like a diesel.
LMoore56