84 Ltd lx 347, t5
Purchased a low mile 347 built by a reputable engine shop. The engine originally had a Holley 750 carb and made 450 hp on the dyno. The previous owner switched out the carb for a Edelbrock Pro Flo 4 fuel injection system. Everything I have read says my idle vacuum should be 14-15. My current system idle vacuum is 7.5, and my power brakes are pretty weak. I have checked everything for a vacuum leak, any suggestions.
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