I have to agree with the Guys when they say that the valve will decline with a SBC. There is a Tradition that you really should consider. I know that was the driving factor when I chose a 5.0 for my Car.
It is really not that bad going into a Performance Shop and asking for Ford Parts.
Now on the other hand, if you did install a SBC....
If you attend Cruise Nights and things like that, at least you will not be totally alienated by the Chevy Guys and you should still be allowed to converse in performance conversations.
All kidding aside, pick yourself a nice Ford motor!