340 build pushrods & rockers best choice???

Since you have a comp cam I would go comp roller tip rockers. I have a mopar cam and use comp roller rockers so it really doesn't matter I guess. Crane rollers are nice but also seen some broke ones also awhile back. If the geometry is correct on the rockers to valve stems , push rods I really don't see problem with Crane, Comp, Hughes. I did use the Hughes rocker shaft retainers.... those are nice.