Help me stop!

Well, I guess this is a "revisited" post, sorta. Hope someone can finally help me sort this out.

4 years ago I did the Scarebird front conversion on my 71 Demon 340, which had the factory big drums up front. The conversion went on fine and thought I had no problems.....until a deer ran out in front of me. Just didn't stop well.

So....went through 2 master cyls, went from a disc/drum distribution block form a 73 dart, back to my drum/drum dist. block. Still the same results. Stops straight, but not very good.

My local dragstrip has a notoriously short shutdown and it's honestly a bit scary.
You couldn't lock up the brakes on this car if Hulk Hogan jammed 'em on, in his prime.

My thoughts are this: the Scarebird conversion uses discs from a Toyota minivan and calipers from a Chev Celebrity/Camaro, so they SHOULD stop this car pretty fast....I think.
I bought EBC Yellow stuff pads, all new lines, everything you could think of.

I wonder if the weak link is the dist block on these cars. I was thinking of completely eliminating it with straight couplings, but I just don't know.

This is a non powerbrake car, and the Scarebird rotors are 10", I think. Single piston caliper. Anyone see a weak link there?

I am planning on ordering the SSBC 4 piston set up, but really don't want to charge something I really cant afford.

I'm at my wits end. I don't want to have an accident from this....or are my expectations just too high? I know for a fact, in the late 70's I was driving a Dart and damn near hit a kid.........those brakes locked up and left 40 feet of rubber on the road. I remember like it was yesterday. I know this car CAN stop well without spending another grand. I just got to a brain "freeze" point now.