I thought I remembered doing this with the 73 roadrunner I had when I was a kid but I couldn't remember if it was a 383 or a 318 I took out to put the 440 in. I think this one has the 81/4 rear end in it not sure on the gears it was a 318 2 bbl auto factory slapstick console car with a 150 speedo. I doubt the 2 bl 318 ever got any use of the 150 speedo hahaha. Did your summit headers seal at the head? I have a set on a 318 in a pick up they never sealed for me so I never planned on buying another set. The TTI headers are way too expensive for this project so I want to find a cheaper set that seal I was thinking of the flowtech headers they sell on fleabay for around $200 any thoughts??????