As skuzzy said the "boss" 302 had it's flaws!
While it could breath well and would windup the revs there were issues with oiling and cooling! The little 02's were known to toss an unneeded rod or 2 and also had the habit of bending valves.
If I was going to build it I would go all matching numbers and in a stock config or I would do a restomod and upgrade breaks and suspension then stick as much crate motor as I could afford!
You can make a backyard "boss" but why? It will get terrible gas milage,it wont make the HP of a crate motor and then you will always have issues with finding a fuel that will actually work,because todays gas isnt the same stuff they used back then! The hitest I remember was RED in color and the "regular" was about 95 octane.
I have a thing for the 66 fastback,cant say exactly why but it's always been my fav.
