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Both of them are dead players IF you ever need to rebuild (bore) them. Both are thin in the cylinders.
I would pass, but I can build my own engines. For you..... GM has a new 383 Crate engine and a short block too. If you can wrench a little....... buy one of the NEW ones and go form there.
1 piece rear seal
set up for the roller cam (you select)
available at your local dealership (no freight)
Just my 5 cents