🚀 go-pugleaf

Hello!
    I'm looking for a flywheel for on a Chevrolet small-block 400.
Specifically, I need the flywheel which is externally balanced, and
drilled for use with a Muncie M-21 four speed transmission.
Preferably, I'd like to find one in the Pennsylvania and surrounding
states area.  If not, anybody happen to know what it would cost to
order one from GM?
     Reason I'm asking (rather obviously) is that my brother, dad, and
I have built a 400 small block with a tunnel ram and dual quad setup,
and need the externally balanced flywheel for use with a four speed.
We have a flywheel that somebody was using on a stock 400 small block
and four speed setup, but it isn't the normal sort of externally
balanced flywheel that GM makes (the GM flywheel has a counterbalance
molded into the back side of the flywheel), but rather it looks like a
standard small block flywheel that somebody drilled out to balance it.
While I guess it worked okay for the guy who had it before we did, I'm
a little shaky about using it on a highly modified 400 like the one we
have. Any opinions?

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Thanks,
Russell Hoffman
rh2y+@andrew.cmu.edu