So what you are saying is you have an original Boss 302? Really rare piece of iron for sure. It was only made for a year (between 2 model years) so you have a 69 1/2 through 70 1/2. The way to check if its a Boss 302 for sure is to see if the intake and exhaust valves are "canted" (sitting "kitty-cornered" to each other). If they are, then you will also have 8 valve cover bolts. That would be a very nice find. If the valves are in a "straight-line" then you have a windsor that has been ported and polished (probably). This will have only 6 valve cover bolts.
BTW this is the "head design" that is used to make a 351-"Clevor" which is a Windsor with Cleveland heads.