Retune my entire carb after installing new heads?

Hysteric said
SpeedTalk thread on Carb sizes

From the guy who built that 750:

Thanks for the interesting article. My engine and cam are a little larger than that 425 so I think a 650 would be too small no matter what...

I am also surprised that the 650 gave the best 330' performance, but not surprised that it was too small at the eighth and, as they estimate, would still be too small at the quarter giving up 14 hp on this particular combo.

Anyway if I only wanted to cruise around town, I agree a smaller carb would be easier to tune and drive ;) But I had it working with the iron heads, I'm sure I can make it work with the new heads too :)