Heres my situation. I bought a used shortblock with no oil pan. I have tried two different 5.0 oil pans bought new from the parts store. They both are hitting the bolts from the oil pump. It is a melling oil pump, I'm not sure the model I'd have to check. I have an old assembled 5.0 block here. I measured and the bolts on the melling pump are about 1/8 to 1/4 inch longer than the stocker. And that is where it is hitting the pan. Anybody have this problem? I really do not want to spend $250 for a new canton pan, and I do not want to hammer the bottom of the new pan. Any suggestions? Should I just buy a stock oil pump?