Braking kills motor

[smoke wagon]

Hi, i have a 4" lifted 72 shortbed, front disc with hawk pads, power steering, 1 ton brake booster, 600cfm holley, 327 rebuilt not long ago, 33 12.50's. The engine runs good and pulls good vacuum however, when i do any kind of braking the motor will bog down. It will idle back up or if i use power steering by turning the wheels it will kill it as i slow. With the 1ton brake booster ill have plenty of assisted braking even when it dies. Any good braking and it dies. Also the ignition is new HEI and tuned petty good. The truck runs great but this braking and dieing problem has me wantin to yank my hair out. Any ideas would be cool. I have searched till blue in face but cant find anything. On a side note just about everything on truck is new.
Ryan
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