On the older SB Chevy flex plate, there's a 153 tooth gear and a 168 tooth gear. The starters are also different. The 153 tooth starter mounting holes are inline with the flexplate. The 168 tooth starter is diagonal to the flexplate.
The 86 and newer motors used one piece rear main seal.
I don't think there are different flexplates for the transmission to used. You should be able to bolt a 700R4 torque converter to a Turbo 350 flexplate.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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