performer RPM air gap v.s ported LD4B

Hi Bloke's,
As I understand the Edelbrock Performer manifolds!

#1. Edelbrock Performer (small port) for 273/318.
#2. Edelbrock Performer RPM (large port) for 340/360.
#3. Eledbrock Performer AirGap (larger port) for 340/360.

I think that covers the current Edelbrock Performer offerings at least in Australia.

The Edelbrock LD4b is again small port for 273/318.
the LD340 is larger port and the runner layout is totally different to the LD340.

my 2cents