The GM piece is fine.
That is what i am running along with most everyone else running a T56.
Is the picture you posted up your trans and bellhousing? What is it and what is it out of?
Depending on what clutch and pressure plate you use, they take different size masters. The GM piece is a 7/8 bore and works with most stuff. I think the Mcleod stuff works better with a 1 inch bore. You will need to check with the clutch manufacture for their recs.
If you do use a GM master it will need to be modified.
What is this going into
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