Looks like 1964 to me. Is it worth $500? Don' know, is it worth it to you? NADA sez the average retail price for a 1974 (they don't go back to 1964) 650E without power tilt & trim is $220.c/6Hooty
You never posted your location..this is a variable that is needed when looking for price quotes or a deal on an engine.In Canada $500 might be fair for such an engine, But in the US $200 would be more favourable.I hope you see what I am getting at?TMD