I have finally put my GEN VI 454/TH400 in its home, but the oil pan is quite close to the crossmember and that is with a 1" shim on the transmission mount. I am using the stock oil pan, stock clamshells, and mounts. I have about 1/8" of clearance. Did anyone use the stock oil pan and not have clearance issues with the crossmember? Thanks for your time.