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You have so many variables and unexplained conditions its hard to even begin to pinpoint whats up. What kind of gearbox, clutch, pressure plate, did you dial it in? 10:1 compression or less you would still have a hard time rolling it over under compression/plugs in.
Did you try to turn the motor over after the two were connected?
My first guess is the tranny and engine are not lined up, somehow
the connection between the two is binding, have you tried rolling it in gear?
This test alone would tell you a lot, did you try turning it over after you had the tranny connected. If it won't turn over while in gear the next move is to disconnect the two and then make sure the engine and transmission will operate freely independently , it doesn't take much in misalignment to lock the whole drive train up.
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