Originally Posted by sedanbob
I don't have any plans to go smaller. I have taken it pretty easy on this one so far (have just over 1000 miles on the odo), but when I put the pedal down, I want every pony I paid for!
Well stepping down to a 600cfm carb would be a step back.
The 750 carb usually is the best for a high performance 350SBC.
Remember the 3310 750VS carb is a "universal" carb. You can improve it
by upgrading to the Holley Proform 750HP VS center body.
You get more flow, more /better venturrii velocity thru improved flow and shape. down leg style boosters
You get swappable air bleeds to allow dialing it in much sharper than out of the box.
You can further custom dial in the action of the vacuum secondaries with
a modified vac sec housing such as sold BY Quick Fuel.
You can mod your own to allow screw adjustment of the vacuum metering bleed
instead of a universal fixed orrifice. you combine this with vac sec spring selection to get it just right for your car. Every car is different.
Plan on doing some drive testing to get it just right.
The out of the box 3310 750 is good but you can make it even better thru custom tuning. It wil do every thing better.
No 600 cfm carb will compete in either power or throttle responce
to this custom tuned 750cfm+ VS carb.
The proform HP carb body does not have a choke.
Its a great upgrade to a stock 3310 carb.
The included jets and idle and high speed air bleeds are a baseline. Fine tuning is required.
The result is worth the effort.
The shape of the base of the air cleaner is critical too. They are not all created equal.
you can upgrade the secondary metering plate with a secondary metering block kit or modify it to allow
swappable main jet changes.