People are saying I should have went with a 750 instead of the 670 holley SA. Would I see a reasonable enough gain to switch. Another question should I put 3.73 in with winter coming or wait until. The car is currently my daily driver.

 

I think 670 is perfect for your 350, could be wrong though. There is an equation to help figure out how much cfm you need. I think on my motor, shifting at 5500 rpms I would need a 670.

750's really are larger ci engines, correct me if I"m wrong guys.

 

Ultimately you get more bang for the buck, buying a 750
The model 3310 750vs is cheaper than the avenger 670 carb and will make more power. But you have the 670 now might as well make the best of it.
Some fine tuning is all it needs to rock.

The 3.73's aren't going to make you any faster in the snow
But then again they won't make you any slower.

 

how hard is it to drive in the winter with 3.73, and right now my car shifts at 6200 rpms. that might not be safe, and I will do a compresion check to see I f someone rebuilt any of the internals of my engine.

 

750 woulda been ideal but 670 will really do alright. Not worth buying a new carb or anything for it.