I installed a 383/727/8-3/4 rear with 11" brakes on rear factory disc on front in my 73 scamp. I am having problems with the brakes. I have new master cylinder, brake hardware, brake cyliners, pads etc. The only thing not replaced was the power brake booster. I have bleed the brakes twice, adjusted up the rear drums. the pedal feels fine until i start the car and then it goes way down. Any suggestions on what to check?

You might need to adjust the rod that goes into the master cylinder to give you more pedal.

I will try that, do you think that the rod may not be going far enough into the cylinder and maybe not getting the fluid pressure into the lines during braking. The car will stop, but i am giving myself plenty of time right now.

That's what I meant but a lot less wordy. I figured if he could do all the replacing he did he would know how to adjust the rod.

If you know the rears are tight I think air still in there

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I have bleed the brakes twice,

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Sounds to me like you still have air in the system.

thanks all, i adjusted the rod a little and bleed the brakes for the 3rd time and all is well.