Re: 55 years ago I was given this USAF 54 3100
For what it's worth, GM called them "TARGET" replacement engines .
Maybe that will help a little bit at the dealer, not in the aftermarket .
We installed dozens of not hundreds of them in our big fleet, mostly 1981 > medium duty rigs .
At one time you could even get 292C.I.D. i6 Target engines, sweet .
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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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