318 idle rpm

Idle RPM has little to do with off-line acceleration.
Proper ignition timing is imo one of the most neglected, but important things on an engine, next to proper air/fuel mixture.

If you're new to carbs (never thought/expected I would hear anyone say that), some good reading on how they work can be off great help. Especially if you like the technology behind it and want to get educated on the subject.