Swapping out a Voodoo

Has Anyone used or have first hand experience with Howards Big Daddy Rattler hyd roller cam - Lift: .530 / .515, Duration @ .050: 243 / 251, Centerline: 103. I have a basic engine - 360 plus .040, port matched and tidied up J heads with 1.93 and 1.60 valves, 273 rockers and KB 190 pistons (small domes). It's in a fly weight slingshot not an A body. running an 8" converter, 904 TF, 4.3 gears and a 31" tyre