My 1971 Duster 6.1 Hemi build

JBrian - how did you find the clearance between the heater tubes at the rear of the intake and your firewall?
That's a really good question; when we mocked it up I didn't check that. We are considering mocking up the finished complete drive-train with Classic Auto Air evaporator. I believe I'm going to have to modify the heater core 5/8" tube to point up toward the back of the motor. I'm sure I'll have to get a local radiator shop to make the modifications.