340 Cam Change - Lunati vs. Comp.
Roller adjustable rockers are the best way to go. ANd there a re a lot out there to chose from. It really boils down to how much you can spend on them.
Entry level low end roller rockers are $200 or less. PRW, Comp Cams, Lunati, Hughes, Harland Sharp, Crane all have some real nice rockers. They range from $400-$1000.
I have used them all, and in the right application they last just about forever. We have used a lot of Hughes rockers here in the last few years, and have had real good luck with them. The new Comp Magnum rockers are real nice too. For your application, I would go with one of these 2 rocker setups. We are a dealer for both and have had good luck with them.