[markjohnson]

Only the 502's have no fuel pump boss. The first gen 502's have a standard timing cover. The 2nd Gen 502's have a six bolt composite front timing cover. That's what I used to look for in my street racing days. A lot of them 502's got turned in to 540's that you better watch out for. In my experience, the 502/450HP cast iron motor seems to run about 12.00's-12.20s while the 505/502 aluminum head motor is fairly common to run around the 11.70 region. This is my background with them in a normal type street car, I'm sure some may be faster and some are slower, but this seems to be the norm.