Yes the 4 hole spacer would be better. It should help your carb. pull a better signal down in the low rpm's. You will have better off line performace without sacrificing your top end.
If you decide to get a new one go phenolic it will insulate your carb. from your engine heat, which can give you a few extra horses.
It sounds like a square bore carb. and intake. Are the holes equal sizes?
You can ask some more question I'll answer what I can, my carb. experience is limited.