As the title says, IM running a 360 in my CJ. I use it off-road about 10 times a year mainly in mud and on trails.

So When I do the Weber TBI what intake manifold should I get?
MPG is a slight factor as I get about 9 now.
I would like to get a bit more out af a gallon.

What should I get for the best MPG and not sacrafice to much off-road?