Which intake would you use?

The street master has true 318 sized ports. It’s a single plane but the runners are small so it maintains good port velocity. I ran one on the 318 in my Challenger with a 600 cfm Edelbrock and headers. It did fine for what it was, that intake is a good match for the stock small port 318 heads and small valves.

That said for a truck I would still be inclined to run the dual plane for low end performance. With a stock or close to stock 318 though I’m not sure you’d notice much difference between the two.