[Superflow]

Back in the day, we used a dollar bill held up to the exhaust pipe to quickly determine if there might be a burnt valve. With a burnt valve, the dollar will flutter as it is sucked in and blown out.

 

[Superflow]

Use a Uni-Syn for balancing multiple carburetors.

Edelborck:
4025 UNI-SYN "A" FOR 1 & 2 BARREL CARBS

Clark's Corvairs also carries them. Page 58 of their catalog:
http://www.corvair.com/user-cgi/catalog.cgi