i did the same thing, it hit my a/c box and cracked it, so it made its own room. i used all f-body stuff oil pan and accesories, except for a/c compressor.Keystone Mark said:I used 1" setback adapters with stock mounts and clamshells in the stock location. I used the stock AC heater box and trimmed the pass side coil mount and coil mount stands on the valve cover. No heater box mods and just enough clearance. I had to access the temp sender and rear spark plug from the bottom but it was far easier than messing with the heater box.