Smallblock intake manifold shootout.

1967DartGT said
I've got both an Offy Port-O-Sonic and an Offy 360*. The Offy 360* was the bridge the gap intake (essentially a single plane with a plenum divider), the Port-O-Sonic is a single plane with pretty large cross section runners (no plenum divider).

rumblefish360 said
A "Port-o-sonic?

And it's the Offy 360* which sits on the 360. Love it. Pop did about a year's worth of research before getting this intake for his set up.