Big Block seems to slow

Rebuilt the carb (found sticking rear blades not opening), retimed again set to 12* initial and 36* total (probably off from ideal due to where the timing marks are hidden under the water pump but seems to be the best I can get for now), new kick down cable, and readjusted shift linkage pretty much fixed the issue. Car now runs and drives like it has a small big block in it has no issues other than still needing fine tuning on the kickdown linkage. Does a one wheel peel with ease now so going from not doing that even when it was wet is night and day.