Ok, odd question, but trust me, there is a method to my madness. I'm trying to mock-up the chassis on my '29 Model A, installing a 302 small block. I've already fabricated my own motor and transmission mounts, but haven't welded or otherwise connected them to the frame, as I want to be sure that I will have enough clearance between the water pump and the new radiator, which will have an electrical fan mounted to it. (I'd hate to weld everything up and find out after the fact that everything needs to be moved back 3 inches, if you know what I mean.) I'm not in a position right now to purchase the radiator, ($) but I'd like to keep going with the fabrication using the original radiator as a guide, if possible. Buying a 'shortie' water pump for this particular engine is also a bit cost prohibitive. So, in short, if i'm using the original radiator as a guide, (or even the front crossmember), how far back should the front of the water pump pulley be, just to be safe?