HouseCallAuto 6/24/2010By now there would be no such template 40 years later. I think it is safe to drill some exploratory holes, after all ya gotta do somethin, don't get intimidated by it. Estimate the locations of the holes by comparing the new motor mounting holes with what pattern shape needs to be drilled. Also, look real hard to make sure there are no marks like a tiny indentation made by GM to tell you where to drill. I have seen that on GM cars before.