So, got a 650 Holley mechanical secondary, sitting on a edelbrock rpm air gap with edelbrock 58cc heads. Before I put the heads on, I had 58/60 jets in the carb. Do yall think I should go bigger with the jets. It's a 1986 5.0 block

 

Are you near sea level? If so I would try it with the same jets that you had in it.
I would be real careful about using larger jets.

 

Yeah, I was thinking about going back to the factory ones that came with the carb. I just don't want to run super lean on the break in for my aluminum heads

 

Holley carbs are usually jetted for sea level at the factory..........