Bob I have a 250/c4 in a 62 Deluxe. Here are my Cliffs notes. Clearence issues 1) Firewall to tunnel had to be "massaged" with a small sledge. Not a lot just enough for clearence, watch you don't hurt the heater plenum on the inside 2) I fabricated lowering mounts for the engine and a drop tranny crossmember. All for hood to carb clearence and I'm running a carter RBS Shortest carb that fits. 3) with the motor lowered I had to flip the center link to the under side of the pitman and idler arms. This required purchase of a 7 degree tapered reamer and reaming the taper holes in the pitman and idler arms the other way. If you don't the center link hits the starter. I also put an 8" rear end from a mustang II in.The 7.25 in there won't last behind the 250. There is barley room for the stock exhaust, a header may have issues. Brakes now need upgrading.