The MII is heavier than a Fox, I would want a 4bbl. Actually OFFY stopped making the 4bbl intake about 2008(same time I had the money and had to find it otherwise) I have a website, it's a marine website, boat parts etc. that may still have some. The carb is like 315 bucks which is about the price for most carbs I've seen. I got my OFFY on ebay for 76 bucks. BEsides you can always go bigger with 4bbls Eventually the 390 will be a leeway point for somnething like a 600cfm.