I am putting a 5.7 Hemi in a 70 Duster using a spool mount k frame from a 73 A body. There are lots of challenges, to say the least. The factory manifolds aren't going to work. I got TTI headers, and they fit pretty good with the torsion bars....but were too close for comfort. I ditched the torsion bars and installed a Hemi Denny coilover conversion kit for use with factory k frame and spindles. I had the NAG1 that came with my 6K mile motor, but quickly ditched that thing because it was going to be such a pain in the *** to make it work. I am using a 545RFE out of a 2007 2wd pickup. I had to chop the transmission cross member into, but that's no biggie. I am going to try a Borgeson PS box with my existing headers to see if it will fit. If it don't, I'll stick with a factory manual box. If you want AC, you will have to re-engineer the drivers side TTI motor mount. TTI told me right up front that their headers will not clear the AC pump in it's stock location on a 5.7 that came out of a car. With a lot of standing under the car and scratching my head....I made it work. There's a LOT of fab work, even with the supposedly drop it in parts, so don't get discouraged.
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