Ignition or a carb problem?

you need to check out the acelerator pump on the carb...

one it needs to squirt gas as soon as throttle is moved...

two the squirter size probably needs to be enlarged to for single plane large plenum intake...

three..the shot needs to be long enough to carry the engine until the main metering circuit is working...

with 107 mph ...you should be in the low 12s.