so bought a 350 sbc has a stock cam and a cheep carb but has a eldebrock alum preformer intake im putin it in my 64 impala but want a new cam and a new carb any sugestions i want it to sound good but not to lumpy not sure what carb to get a guy said a 750 cfm but isnt that way to big for a 350 i was thinkin 650 or 600 but dont know anything about motors or carbs or cams please help any sugestions would be great pics of motor to come after all work is done also pics of car to come soon as it gets a motor and a new back window

Carb size depends upon usage. A lumpy cam is to shift the power band up into the higher RPM ranges (your heads may not support deep breathing required for high RPM use) where a bigger carb is needed to move more air. At lower RPM the smaller carb gives better throttle response.

Big Dave

Couple of things to think about:

-How will the car be used? Street driving?
-How many miles are on the engine?
-Does the engine have headers?

Cam:
Best to stick with something mild or you will be needing your heads done up for better springs, studs and all kinds of specs need to be checked in the upper valve train, depending on the lift of the cam.

A larger cam would also dictate the use of headers since installing a new cam is meant to improve the 'breathing' of the engine.

Look to a GM cam or one that uses factory specs. You may be able to go up to a higher performance factory 350 cam that won't require modifications to the rest of the engine and will still give you good low-end torque. Just remember, you will need to replace a lot of other components with a cam change as all moving valve train components "wear" together. You will probably need all new push rods, rocker arms and possible a valve job. Also a new timing chain and gears. It's all a trickle down effect when adding higher performance components to your engine.

Carb:
Like Big Dave said, the size of the carb would be dictated by the cam. A 750 cfm Holley would work on a 350 if it had enough breathing from the cam and some headers. There are a lot of other things that play into this scenario, including modifying your ignition and fuel system for starters in order to get the best performance from the new cam/carb.

-Scott

street driving
motor has about 20,000 after rebuild
decided to stick with stock cam
it does have a gear drive so sounds awsome
has headers
so any thoughts on carb 600-650-700-750
its only gonna get driven sat-sun 50 miles a weak or so for fun all street/highway

street driving sat and sun prob 50 miles a weak or so all street and some highway

decided to stick with stock cam
i do have headers
motor has a new gear drive :)
motor was rebuilt 20 to 30,000 ago
so dont want anything to fast but want it to be peppy any thoughts on carb choice
600-650-700

A Rochester Quadra-Jet for a small block Chevy if you have a Q-jet manifold available for it (BBC Q-jet moves 780 cfm). If your manifold is a square bore then a Holley 600 to 650 cfm in either the 4150 or 4160 style should do just fine. You can by these carbs all day at swap meets for $25 bucks and rebuild them for another $35 for a rebuild kit.