I have hydroboost on mine and pedal feel is perfect. I run the OEM 69 disc's up front and have the S10 Blazer rear disc conversion, the parts of which I picked up in the local Pull-A-Part. The hydroboost unit itself and the correct firewall mount came from http://www.custompowerbrake.com/ The M/C is a 4 wheel disc Corvette part.
Based on my experience, I feel hydroboost is well worth the effort.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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