I have a 440 in my Dart with the Schumacher motor mounts. When I put the NOS plates on I needed a 1/4" more hood clearance. I put the 1/2" spacers between the frame and k-member with no problems at this point. No issues with TB's, exhaust, steering, fuel, throttle cable, trans cable, cruise cable, wiring, hoses, or anything else. My only concern was the fan shroud clearance and it turned out I had plenty. Check out the pic of the spacers I made. I countersank one side of the holes in case they came in contact with the bolt. I loosened all four bolts, took them out of one side only, pried the k-member down slightly, slid in the spacers, replaced the bolts but not completely tight. I then installed the other side the same way. Torqued all the bolts and good to go. Hope I didn't forget anything:)