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Ca'nt understand why someone would go to the effort of re stamping an engine and not make it correct.
......
Wonder if anyone was restamping blocks prior to 1973?
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Well....if you don't
know what's 'correct', then it's real easy to get the stamp wrong
Guaranteed no one was restamping blocks prior to 1973 - or even 1983 for that matter.
It's highly unlikely that an engine built in mid June of 69 would have had the 3 letter suffix, because that was not started until very, very late in the 69 model year; probably some time in early July at the earliest. Then to have that engine sit around for 8 months until being installed in a car?
Put all these things together and I think there's good reason to be suspicious here.