EQ heads question

Who is the "official" importer of the EQ heads. Or the RHS heads,

OR THE DANG IRON, FLOW BETTER THAN MAGNUMS, CAN BE HAD WITH LA OR MAGNUM INTAKE BOLT SETUP, CAN USE STOCK MAGNUM VALVES, THE BANG FOR THE BUCK, 300 DOLLAR A PIECE BARE,

heads? :D

I am confused as to exactly who and where they are coming from.

I want to get the specs on the spring pocket dimensions and such of a bare head.

I know that the heads were sold by somebody at one time who went out of business, then somebody else started making them again.

I just want to know the exact scoop.

Thanks.

EDIT: I suppose I may as well tell what I want to do with them. I have a set of already ground and cleaned drop in magnum valves. Got a score on a 65000 mile LA Roller 318. Want to do a magnum head swap on the 318 with a weiand action plus and a thermoquad, reground cam, to push around a 323 geared street car.