Roller cams don't really provide much advantage until you start getting into much larger duration and lift profiles. Up to about 270 duration, a flat tappet can still accelerate a valve of the seat faster. With todays oils, not much of a friction reduction advantage with rollers either.
Spend your money on roller rockers.
Here's another cam to consider for your application: Engle 35018H.
Your lifters would work with any hydraulic flat tappet cam.