My sedan has a 327 with the 1803 & 1804 (500cfm) carbs. 1803 is a manual choke (front carb choke wired open), 1804 is electric choke (rear carb). The rear carb is the primary carb and the electric choke works great. It has progressive linkage to the front carb and is adjusted as tech advised. Someone told me I needed to set the linkage non progressive periodically to keep fresh gas in the front carb, I told them my foot does that automatically.

The kit I purchased came with darn near everything you need to install it (sans an air cleaner). The carbs were pretty closely tuned right out of the box, only needed minor tuning (Edelbrock tech will help you with that). Be sure to install a good fuel regulator and set it at 5.5lbs max or the floats will leak (even with a stock mechanical pump). My carbs perform real well, you kick it a$$ and the mouse gets angry quickly! MDS ignition made mine run even better, as did re-curving the distributor's mechanical advance to come in a little quicker.

The only other issue I have had is the alcohol blended gas is real hard on the rubber parts, ate up the mechanical fuel pump's diaphragms (twice, a year apart). I installed an electric pump (my mechanical was real hard to get at) and now use a fuel stabilizer, it seems to lessen the rubber deterioration.

My recommendation, if you like the dual quad look go for it, you won't regret it! Once tuned they are set! GOOD TO GO!