Actually the stock intake flows just as good as the Edelbrock manifold..Dollar for dollar the stock one beats the edelbrock one up and down the road. I mean you can get a stock one from a j/y for under $50, versus a couple hundred for the Eddy.
Alright, call 1-800-230-3030 ask them which intake manifolds will fit on a 318. Tell them what your plans are, they will help. There are quite a few companies that make intake manifolds. Off the top of my head: Edelbrock, Offenhouser, Weiand, Trick Flow, Dart, Dorton, Brodix to name a few.
RamchargerCentral.Com is a Dodge truck community built by a vast number of experienced owners. Whatever you're thinking about doing from routine maintenance to full-on restoration, odds are somebody around here already has. Originally focused on the Ram Charger / Trail Duster, our members own, drive and wrench on Mopars from the 40s to the current day. It's not what you buy, it's what you build.