Just throwing this out there (and NOT suggesting that you toss all the work you've done to get it this far). I have a 480 BBC with a 3" Crower stack in my supermodified. It runs great with a -1/2 pump. I'm (simply) wondering if the -1 is really "too much" pump for the application, which is putting you into a window of bypassing a LOT of fuel. When those poppets open to those big jets, I could see the potential for a big dip in fuel pressure. That combined with the overly large nozzles (mine are 35s as well, IIRC) might make it tough to get the car consistent. The transbrake will obviously mask some of this, and you're not running the same wide range of rpm I am. I agree you should definitely get it flowed as a unit.