Hi Durandal25, I think it's one of the later 383's. The only number I've seen so far is G383 11 232 I believe the G means it's a '71? Read somewhere that the 71's were not so hot. So, yes, needs a rebuild to spice it up somewhat!
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I'd never heard that.....but, after looking never found any detail on that. The 383 is one of the best, and most reliable motors ever built. I've had several....all of them treated me right.