SHORTY headers vs. good Ram Air manifolds? (by good I mean the ones from Ram Air Restorations)...
I've not tested them personally nor do I know anyone who has, but my OPINION is that the shorties will have zero performance advantage over a good set of manifolds, plus you'll get many of the disadvantages (i.e. gasket seal, tendency to rust, etc.). For my money (and perfomance) it comes down to a choice between full 4-tube headers (for max performance) and Ram Air manifolds (for DECENT performance with minimum headaches).