well excactly where would you like to start?
A BOSS 302 engine was produced by ford to compete in the trans am racing series in 1969.It was only in production in 69/70.
It was a hybrid engine using the canted valve heads from the soon to be released cleveland engine on to a 302w 4 bolt block.
They ran 4v heads,solid cam,780 holley and dual point distributor form factory.
It is easy to recognise a boss 302 as it uses the cleveland heads which are much larger in profile than the windsor heads.Of course they run a special intake manifold of which there are aftermarket versions available.
One way to identify an original boss 302 block from the outside is that they use screw in core plugs instead of the traditional knock in type.
Hope this helps.