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I also have a chrysler 440 that I installed in a M about 2 years ago. I had a complete new steel flywheel made to the orig cast size so that I can use the orig starter. I had the same machinist true up the orig adapter plate so that I could bolt new motor in the same way old motor was. I did not have to widen or stretch the frame rails to get motor to fit in, but did have to grind a lot. I bolted motor in and then welded front motor mounts to frame rails. You will have to use electric fan as new motor will sit a lot lower in chassis than orig. I used a pressure plate from a ford diesel pickup and am using a heavy duty clutch plate from a M (splines will be same a input shaft into orig transmission/rear end- which I use). I have 18.4x38 cut tires on, I pull at 6000 rpms (I use a MSD 6AL rev limiter as a governor) in 2nd gear which is 12-14 mph pulling a sled. I have a estimated 400+ hp (no way to check for sure). I pull in 5000# to 7000# open, tractor with me on weighs 4800#. I have been down track 39 times with this tractor and trophied 36 times with 3 DNF from mechanical problems. The only problem I have with this tractor is all the whining from the open pullers who used to kick my butt on a regular basis with my other tractors and now find it easier to complain. I guess that it would be more "fair" in their minds if I had spent $25000 on a hot motor and then "appeared" stock, (I have less than 8k in tractor). I have some pictures and some video that I haven't tried to post on here, maybe my wife can if I ask her nice. There is a gentleman with a 420+ci 460 and another with a 800+ci MM that are both exremely tough, we take turns beating each other. GREAT competition and not afraid to pull against me!!! If you need more help, just ask.
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