Late Auto Crank to early Manual Spigot

As MOPAROFFICIAL stated, You'll have to machine the Flywheel ID to fit the newer crank, mainly because there aren't any later flywheels compatible w/that trans/bellhousing. As Rusty stated, core-hole plugs, that's all..... As Pish stated get the roller, but since You've got the later crank, the later/Magnum roller insert would be ideal. Goes in the converter-hub register. Good luck with the install!