Take a careful look at a solid roller cam ground with between 260 and 265 @.050 on the intake lobes with as much lobe lift you can get and from 264 to 270 @.050 on the exhaust ground on a 108 LSA installed from 104 to 106 on the intake lobe centers. Buy the roller lifters with the .820 or larger wheels also. I had a very similar solid roller custom ground Comp Cams that I ran a set of the Mopar brand solid roller lifters with the .750 wheels at first (two of the wheels ended up breaking in half ) with a set of Harland Sharp 1.6 ratio rockers and them switched to a set of solid rollers with the larger .820 wheels and never had another lifter problem. The larger wheels make the cam appear bigger to the motor due to opening the valves faster and with more lift in relation to the crankshaft That motor ran faster with the bigger wheels in the lifters with no other changes