What is your initial timing set at.? You need to setup up your initial timing, then setup your mechanical timing all in usually by about 2800-3000 rpm. You can then add vacuum timing to your liking through a vacuum can and connected either ported or manifold vacuum.
Mechanical timing is done with the advance weights by the usage of selected springs and selective bushings.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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