351W roller cam

I have a 1985 351CID windsor smallblock that i am rebuilding, and i was wondering if it is possible to replace the stock hydraulic flat tappet valvetrain with a hydraulic roller type valvetrain. does anyone make a kit for this? is there any machining involved?

i found a kit from summit racing made by comp cams, it runs around 800 bucks for the kit, which does NOT include pushrods or rocker arms.