This may not answer your question about erson ones but here it goes. I have the road variable duration lifters. They seem to work for the most part if you can live with the noise they make. Kinda sounds like un adjusted lifters. I'm think about switching to the crane variable duration ones. They say they don't produce anytype of noise. Probably get them in april.
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67'fastback- Edelbrock carb, intake, cam, valve springs. Road lifters, Comp Cam rocker arms, windage tray, cerama coated headers, dual flows with H-pipe, modded c-4, tci stall converter, perma cool electric fan, aluminum water pump, griffen aluminum radiator, accel 8.8 cable, wide cap distriburator, magnetic pick up, manley valves, v-matic hurst shifter, edelbrock performer nitrous, carter electric fuel pump, ignitor coil, solid motor mounts, magna racing suspension, poly urathane bushings, und
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