Not even going to try to use those carbs. I looked them over and the jetting is so far off from stock I didn't want to touch them. Looks to me like maybe they were set up for Q16 or E80 or something like that. Did not appear to be a race gas tune. I just unbolted them and put them in a box for safekeeping.

The engine ran great with these 500 cfm Edelbrock carbs. Every time I swap over from Holley carbs to Edelbrock carbs I'm amazed at how much smoother the engine runs. For an engine like this the dual Edelbrocks are probably tough to beat. If I had a pair of 600 Edelbrocks I'd try them but I doubt this engine would make any more power.