Have a 360 with Edelbrock heads and solid cam currently only has as a .528 lift, but may upgrade in the future to something that is closer to the .600 lift range. I'm currently using stock 273 factory rocker arms. I would like to upgrade them to something a little better, would love to get a set of Harland Sharps, but they are pricey. Has anyone used Comp camps 1622-16 or Mancini Racing rockers? Any issues with them? This is a race only motor and only see's 6500 rpm max.

I can't answer any of your questions, but you can buy those comp rockers online through autozone for $460 using their 20% discount. Just an FYI.

Many stocker eliminator drivers spin a trued 273 rocker in excess of 7000 rpms.

I have used the Comp roller lifters for a long time. Very good.
I just picked up Hughesengines roller lifters for another small block. They have a good reputation and I heard but don't know, there made by Dove.

I use to race and build NHRA stocker motors, most stock OEM ductile iron rocker ratio vary a LOT
Some of the better after market aluminum and steel rocker do also
I buy the best rocker I can justify for my builds
That being said I don't put Jesels on a pump gas street motor but I do use Harland Sharp aluminum roller rockers a lot I'm building a pump gas 340 4 inch stroker motor now with Harland Sharp rocker assembly, nice stuff
I have had RAS blueprint, bush and ratio correct stock ductile iron rockers in the past, no more The reason being for a little bit more($100.00 to $300.00) I can buy brand new race parts