Lengthening the pushrod won't do a thing. I lengthened mine and about a half inch and at that point it was pushing the piston into the bore. Forget lengthening it unless you plan on doing some serious fabricating and moving the entire brake pedal assembly back a little to compensate for the longer pushrod.
I went back to a stock pushrod because lengthening it would create more problems.
It won't be too long before I go back to the stock m/c either.
As far as bleeding the fronts to get the pedal to go to the floor - I couldn't get it to happen. Couldn't get a stream if I tried and I tried everything! I even cracked both bleeders on one side and tried that. I even tried to experiment and removed the stinking drums to just see if "an adjustment" problem was occuring - by allowing the drums on all fours to expand without restriction, an din theory allowing the piston to "travel" more and push out m ore fluid.

Nope....adjusting your drums in my humble opinion and almost 20 years of working on cars has nothing to do with how successful bleeding your brakes will be.

I've bled tons of wheel cylinders and the pedal always goes to the floor or drops when cracking the bleeders. I couldn't get the pedal to drop no matter what I tried. Something is wrong...