70 dart 470 ci drag car build.

In the context of what you are saying the B1BS was never ahead of the -1 Indy unported especially. They aren't a bad head but even 'all-out' they can't touch a similar prepped -1. Even though B1 original is a better head you'd rarely find one run better than a good -1 build.
THats interesting, I think that will be my have to be my next upgrade especially at the cost of B1 stuff.
But I'll see how this thing runs 1st obviously