Wasn't the GMC block about 2" longer than the Chevy? Back in high school in the 50's the bigger displacement GMC's were a popular switch for your early 50's 216 or 235, the main problem was dealing with the extra length. Could they have cloned the GMC engine? I'd like to see a picture of one of the early Toyota engines you guys are talking about, you know how I like pictures.
DG


Denny G
Sandwich, IL