Roller cam for slant 6?????

Bill, you'll get the same info here as you did on .org, maybe less.

There really is no need for a roller in a Slant. The problems you have to overcome far outweigh any advantages.

With the small lifts and valve spring pressures on a Slant you should never have trouble with the dreaded lifter wipe anyway. Just make sure the lifters are rotating in the bores during break-in.

I've broken a lot of parts, but never wiped a lifter, even using used lifters on new cams.