1. Yes, it's the latest version of the Procomp/Speedmaster clone of the early 75 cc chamber Edelbrock Victor, with their CNC-ported option.

2. Dwayne Porter (fast68plymouth) has a fairly recent thread about a set he prepped, which I'd recommend searching for should you have more-than-casual interest in them. Like anything, you need to be aware of the good and the bad, since you really do get what you pay for.

3. You don't want Procomp/Speedmaster valves, anyway. The Edelbrock Victor 2.20" intake x 1.81" exhaust valves are much higher quality and can be purchased in sets of 8 each separately for a reasonable price (figure about $300 +/- for a full compliment of valves).

4. Keep in mind that these heads require offset intake rockers, too. I think the minimum that works is .600", with some brands having a bit more or less than that. IIRC, the Procomps also require a good bit of clearancing for the intake pushrods, too.

IHTH...