Correct SB starter brace / Flywheel size?

[oneZ11]

Hi Guys, I've got a 350/300hp, with M-20 4 speed. What would the original (stock) size flywheel be for that? 

Bought a repro Starter Brace that's doesn't fit. About an inch too long. Starter Brace description says, "Small Block for cars with 12 3/4" Flywheel."

Any help with that?

(See pic)

[tmodel66]

You need this one. From Classic Muscle part number 2167GM. This is for the 11" clutch.

http://www.parts123.com/parts123/yb.dll?Parta~ShowPicTxt~Z5Z5Z50000358f~Z5Z5Z5FAENI~Z5Z5Z51

[oneZ11]

Yes, have 11" clutch - that should be correct, thanks...