Re: engine balance
I'm pretty sure that the 50oz. weights didn't start until the "5.0" came along in 81... It should still take a 28oz. weight on the flexplate/flywheel...
As long as the transmission input shaft fits the clutch disc, I'd match everything up with that engine.... You also have to make sure that the bellhousing is the right one for the flexplate/flywheel...
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