a YB could also be a 1975 350 2bbl...155 hp...or 76 160 hp
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letters, however, are YB and if I'm looking at everything right, it seems that it's a 400. The hood then is probably the original, and the original engine was most likely the 326.
most likely a 326 original...with 'flat' hood.. when I bought my car it was advertised as a 400...never saw the hood on the picture the divorcee had put out, but as I saw the car I knew it wasnt an original 400...but it DID have a 400 in it, a 72 with 7J2 heads...I later replaced the heads..
then I bought a 400 hood , re badged the car to "clone " it to a 400....
