[MARKDTN]

Sorry, I meant 2-pc rear seal and 1-pc rear seal. All 305 and 350 are internally balanced. You just have to have the correct one for the type of rear seal you have. Through '85 I believe all are 2-pc rear seals. '86 up, all production cars got 1-pc rear seals. The Crate engines can be had both ways.

Bottom line is that all Chevy V8s (assuming correct crank type seal) will bolt onto each other. The same flexplate works for everything but a 400 small block and a 454 big block. These are the only 2 externally balanced. So for a 2 pc seal motor the same flexplate will work for 262, 283, 302, 305, 307, 327, 350, 366, 402 and 427.