have you tried asking for help on a site like gmt400.com ?
There tends to be a lot of activity there, and someone there should be able to tell you what you need.
I have bought parts for my 1992 K1500 from both Rockauto and LMC - As I am guessing you are aware, both sources will sell you wrong stuff, so you have to do your own due dilligence...
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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