i used scat 4130 crank and h beam end cap screw rods, 4.250 crank, 6.385 rod with wiseco forged piston.
the crank i got was external balance as well but there was a certain part number that was almost always too heavy and not light as its way cheaper to take weight out, then ass it.
hopefully you don't have any issues, the rear main will be fun enough. goodluck
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