It is trickier to tune a 4 speed. You are going to have to work thru the tune from both timing and carb adjustments to find what works. It may be as simple as less vacuum advance, heavier springs to delay mechanical advance,a little more fuel etc. Its trickier with a manual transmission since there is a direct link to the engine.
Like has been suggested a "few" times get a timing light with a tach it will open your eyes to what actually is happening as the engine revs up. Plus when you make adjustments you can document your changes.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2,generic one inch open spacer
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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