Hi truckntran,
I'm a little jambed up for time right now but here's what I can tell you quick. Like Matt said, on the flywheel side of the 1250 motor take everything off up to and including the bearing plate then put all of theose same parts back on from your 122 motor. Then take everything off of the crankshft side and put your starter pully on from the 122 motor, the tricky part is that the 1250 motor may or may not be drilled for your s/g bracket, if it isn't you may have to build a bracket that will work, not sure without looking but you may be able to drill your 122 frame rail and bolt your s/g bracket there and get a longer belt, not sure if the belt will clear the frame or not, the s/g may need to be elevated to get the belt on. that should be about all except for adapting the choke and throttle cables and the exhaust is also a little different.
Good luck with getting it done for the weekend.
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