Don't forget you'll need a 3 bolt starter for the V-8;they're still available through the local parts stores. You can use a high torque starter motor and swap the 3 bolt nose piece onto it if you want a little more oomf for cranking the engine. When you get your bell housing,be careful to make sure the bottom starter hole is intact. It's easy to break off the corner of the bell housing there and ruin that hole. There are also different sized pilot holes available in the iron bell housings;try to get one that fits the front bearing retainer on your SM420,or you'll have trouble with the 4 trans. bolts trying to loosen. If you get a flywheel that can take an 11 inch clutch you can get a 12 inch diaphragm clutch that fits the same pressure plate bolt pattern. There's a long and a short release bearing;make sure the one you buy matches with the type of pressure plate you use. You may be able to use the mechanical clutch linkage from the six.
To mount the engine,the "horse shoe" mount was used on the early 60's V-8's;if you want to use a big block engine,the "horse shoe" mount from an early 60's 348/409 powered 2 ton will fit,most of 'em are drilled for big and small block engines. I used an old Hurst saddle mount on my truck just because I happened to have one,built the frame mounts from a couple of pieces of heavy 2' angle,and used flat head V-8 mount pads with Nylock nuts. Bullet-proof set up. BTW-a small block powered 2 ton truck will have "rams horn exhaust manifolds,but they fit a bigger pipe size than the car rams horn manifolds would fit.
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