The Edelbrock street master intake is an old design, its a single plane intake with 318 sized ports. So, it won't flow as much or as well as one of the new Air Gap manifolds.
BUT, its a GREAT intake for a stock 318. The ports actually match 318 heads, unlike all of the new intakes, including the plain old performer intake, which have 360 sized intake ports. Using one of those on a stock 318 will lead to a huge step at the intake/head, with a sharp edge and everything. Probably one of the worst things you can do for flow.
So for a 318 its a great intake if you don't want to port the heads, so its perfect for 2 to 4 barrel swaps. For a 360, you'd be much better off with a Performer or Air Gap. Although having the ports go from small to large is better than having them go from large to small, you'll still be restricting your 360. Sell the Street Master to a guy with a 318 and buy a 360 manifold :thumbup: