Recommended 4bbl carb for stock 318

VolksDuster said
Hey, Sorry I've been away for a bit.
First I should start of by saying, thanks for the input.
And I was actually hoping to find a period correct carb that would have been used on small block Mopar's and had reasonable reliability, power and economy. I am aware that 1973 318's never had 4bbl's and that the Carter BBD was the best option for 2bbl, but I'm hoping to maintain the look of a stock small block with a bit more power.
Also, it seem everyone has the input of jumping to a high CFM compared to a big 2bbl or smaller 4bbl. I didn't realize this was the goal is size for power and economy, I would have expected around 400CFM. I do have a Holley 850 Double pumper.... I wish I had a cam and pistons and intake for that thing.
So why 600CFM? Is there much gain in horse power and economy over a 400CFM?
Also there seems to be a discrepancy in the Edlebrock that most are happy but one said they can ice up? I do live in a cold climate so in the winter I do start it up every so often to keep everything lubed. Has anyone else had this kind of issue?, I never seen this on a stock carb, so I can only assume it's due to thin aluminum?
And on top of all that I really need the cost to be as low as possible and still get quality.

Thanks
Chad

Chad, you have been given the best answers already. IMO, the Edebrock Performer intake and 600 cfm carb will work the best unless you just favor a Holley carb. Been there done that. This statement from you is the deal sealer for what you want. It is what I use and have been using for a long time.
"And on top of all that I really need the cost to be as low as possible and still get quality."

Of course, you can try old, used, swap meet parts ......

A 400 cfm carb will work OK, this will leave the engine short of breath when the rpm's clime high. A 600 cfm carb covers this top end rpm area. Also the primary side is larger but not a waste since it also allows the engine to breath much nicer. Any carb can ice up and if the fella above had issues, he will need to look into WHY! and not just complaon about it. I live where temps an fall below zero F* height degrees and I haven't had any problems with MY AFB's once the engine is warmed up.

I wouldn't use the 850 Holley but, do what ever ya want. I feel like your beating a dead horse here.