Yes we ran tapered ones but for a different reason. We needed the taper at the bottom so the large diameter of the push rod would not interfere with the side of the lifter. We ran an offset lifter seat. At the rocker arm end we needed the taper for clearance with the dog leg shaft rocker arm. Your situation with stud mounted rockers will be different. Your lifters do look good. But as a final check, if you have an old sheet of window glass laying around, put it on a work bench. Then lay a piece of newspaper over the glass and spray it with WD-40 to stick it to the glass and provide traction for the lifter wheel. Then push the lifter firmly on the glass/newspaper and roll it over the glass. If you hear any "crackling" noise or feel anything at all in your fingers, other than super smooth, the lifter needles are failing, or there is crap in them. It is an excellent,easy test for roller lifters. Good luck getting this fixed.
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