Roller Valve Spring vs FT Valve Spring

Okay, I got you! The item we need to confirm is the Edelbrock 9736 retainers. If that's the case, you can go with a set of 5845 Edelbrock valve springs. These were what Edelbrock ran on the hydraulic roller version of these heads with the 9736 retainers with 150 closed at 1.800 installed height, 420 open at .580 open.
Edelbrock Sure Seat Valve Springs 5845
https://www.edelbrock.com/sure-seat-valve-springs-5845.htm
I'm looking over other options but it appears that Edelbrock went out of their way to design spring retainers for an outer spring inside diameter no one else manufactures.