Recommended 4bbl carb for stock 318

What price would you be paying for a 400cfm carb and what would it be for a 600cfm carb? You looking at new or used? If the 400cfm is cheaper, buy it.

You’re asking for something that will be fast, cheap and reliable. All three together do not exist. You have to choose 2 of the 3; which two are most important to you?

Not sure where in Nova Scotia you are but it’s not as cold there as on the prairies. I’m on the west coast and haven’t had issues with my 600cfm, nor the stock 2bbl it had before. When I had my Scamp in Edmonton for a few years, the 2bbl handled the winters alright. Any car, even modern ones, are not going to run well in -25 to -40 until they are warmed up.