Changed to Manual brakes from power brakes

I replaced the push rod for a stock manual brake rod, stock backing plate,I retained the stock power brake proportioning valve and stock master cylinder. I bled the brakes front and rear, O.K. After said and done My front two calipers locked to the rotors and will not release unless I open up a bleeder screw. What is the problem now ? I have a line lock connected, working fine. 73 challenger, Thanks to all for your help.

Push rod too long and not releasing pressure could be one problem

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Push rod too long and not releasing pressure could be one problem

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You need to have a slight gap between the MC piston and push rod when the MC is bolted in. I shoot for 1/8" gap.