Just for testing purposes, unbolt the master cyl from the booster, add a washer on each stud to act as a spacer and reattach master cyl. If that fixes the problem then there is an interference issue with rod from the booster to the master cyl.
Also, I have read that old rubber lines can create some really goofy braking symptoms, so unless they are brand new already I would replace those.
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68 Firebird, trying a q-jet now. 434/10.5:1/997's/240-242 HFT/4L80E/2800 Yank/3.42's/ Vintage Air/ 13.0 @105 mph
70 Lemans, 350/350, A/C, mostly stock
14 Ram CC, 5.7 Hemi, 8-speed, 3.92 lsd
97 Trans Am, HPP Aug 2012 http://www.highperformancepontiac.co...tiac_trans_am/ ***Sold***
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