473369 exhaust manifold
It's been a while since I worked at a GM Dealer but they used to be able to do a nationwide computer parts search, now that you have the #, maybe go to your local GM (any GM Dealer can run GM part #'s regardless of brand) and find one languishing some where.....
I found more than a few parts fpr my old 1949 Chevy 3100this way .
I'm searching but wow, this is a hard to find part .
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-Nate
Geezer
'49 3100 235 W/ Muncie SM420 SOLD
'69 C/10 shortbed sidemount survivor 250 L6 W/ 350TH 
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