Agreed, SBF is not a bad choice. Good engine. LOTS of "goodies".
The two "coolest" street rods I've seen in years had a different "Fords"... One was a '32 CHEVY "5-window coupe" in a club full of '32 FORDS, all with SBC engines. It had a Cleveland in it... It's name? "Bad Attitude"... I LOVED it!
The other was more of a "rat rod" (before they were "cool"). It was a T-bucket with a 300 6 cylinder. Sounded a lot like an airplane... Drew a LOT of attention.
While the Windsor "family" is more plentiful (260s, 289s, 302s are also "Windsor" engines), the Cleveland is the ONE. For a small block, it's pretty hard to argue with the look, the power and the "cool factor". There are still MANY out there, and new performance parts are readily available through all "regular" sources.
Or, you could always go the "never send a boy to do a MAN'S job" approach. 460s are plentiful and relatively cheap. No other Ford engine has more potential, possible excdeption, 427.
Just some ideas.