Quote:
Originally Posted by beanstock
Mine is a 64 GMC also and has a 305E also and I know it's original cause my dad bought brand new and gave it to me a few years back.
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Yep! One Easy way to tell is on the back of the intake. There will be a month-day-year stamp there telling when the engine was made. In my case..1967 telling me an engine swap was done...which is cool cause mine is the more powerful one. lol!