IMO, any engine that is going to be used in a performance application that will spin above 5000 rpm or so should be over balanced.

Your going to shift at 6400 and stripe at 7200 or so. Your a canidate.

Further, your more of a test and tune guy, looking for max performance "WHEN" you ever get your car out for a few runs.

Vizard found extra HP everytime when Testing the effects of OB.

Further, I think Every engine can benefit from a slight over-balance.

I feel the benefits from over balance have been out there a loooong time. Lots of builders , maybe even most in the know OB, IMO

The question is how much? There are elite engine programs out there that can calculate that amount based on your componet weights. For most engines 51 to 52 %

Further it is known that a engine can never be Perfectly balanced at All RPMs. So I say balance it at the point where it can give the most performance benefit for what your trying to acomplish.

In a performance Rpm enviroment, OB is the proven way to go. JMHO Id at least go 51% in your case. Its not going to hurt a thing and most likely help you.