Mark---I believe one way to tell if your engine can handle more
carburetion is to view the air valve positions, when the engine is at,
or near max. rpm. This should only be done when some sort of load can be
put on the engine, such as when on a dyno. A lesser choice would be with
the drive wheels off the ground and some braking at these wheels. If you
see the carb air pistons at at the top of their lift, it is using all of
the air and fuel. If it's not, the engine may not be capable of pulling
in yet more air, thru use of another carb.
More compression and a lighter flywheel may be what you are looking for.
Dick
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