Mancini had Edelbrock Magnum heads on clearance a few months ago. Not sure they'd get any more.
Promaxx deosn't have the Magnum style head either that i've seen.
I got two NHRA unmarked ones on that sale. Paid $659 each full assembled. But charged me $100 shipping after the invoice was billed and paid.
I would not trust Mancini's staff. I've been lied to too many times over the years. And their rip off shipping system. [/rant]
Summit says the RPM 61775 will ship tomorrow. These do have the Edelbrock RPM markings on the ends.
This is the Dual spring one. The single spring will ship 5/21/2020
https://www.summitracing.com/parts/edl-61775