Roller cam/lifter retro drop in, thoughts?

Thanks all...
Good suggestions, but, here is what I was looking at.
This is not going to be a race motor, mild street performer, maybe a little more with the 4 speed. I see these drop in roller lifters now available. No block machining of the lifter bores like the old days. They say, drop them in and go? I want longevity and no hassles with cam issues that seem so prevalent with todays oils. The other option, just go Hydraulic flat tappet cam as normal and use the additive, which can get expensive in the long run. The old pay now...or pay later deal. A roller would be trouble free (hydraulic roller) no oil issues to consider.
Thank