[V8 Bob]

Originally Posted by jimTN

What did the 390 come on to begin with?

The original #0-6299 390 CFM came out as a street/competition carb in the late '70s/early '80s for 4 cylinder Pintos and Vegas. This one has a special float and reversed power valve to prevent high speed vibration common on the 4s. Part # 0-8007 390 should be used on 6s and small 8 cylinder engines.

Originally Posted by joe plumber

Where does one purchase the vacuum part that allows spring changes without removing the diaphragm ?

Part # 20-59 quick change vacuum secondary diaphragm housing cover can be purchased at most speed shops along with Jegs and Summit.