I believe I have a late 1980's 460 motor, in a 1978, 21' Tahiti Boss.
Is there a way to find out the year of motor?
Looking at getting better performance.  I believe all is stock, points, stock manifold, not sure carb but a Holley.
Suggestion please..:-)

Salem, Oregon!!

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Look for casting numbers on the side of the block and heads.  Format is "D1VE", "D0VE", Etc.  This will give you a starting point to at least know what you have performance wise, then you can go from there.

 I don't want to ruin your dreams here but what type additional performance are you looking to get?  Fords are not the easiest/cheapest engines to build substantial power in, minor tweaks can help but make sure you have a realistic goal or lots of $$$$!  Post up the numbers you find and we can help with what you have currently. 

These heads are badass

http://www.hotrod.com/how-to/engine/0707phr-p51-cylinder-heads/