Ok, no pro here, but you HAVE TO RUN anemic valve springs with a cast core roller; so you've limited the RPMs to maybe 52-5500 TOPS, and DO NOT want to make big power; if correct, then its fine. Me personally, I'd would NEVER run a cast core roller unless it was a old wood truck or something, for free. Rollers = used to be race car stuff = BILLET cores only.
Yet again, you keep it mildly "sprung" and under 5500, it SHOULD be ok.
All that is agin' my "religion" ; I hate losing HP when I rpm. ( my new BBC is limited to 6300 BUT, the springs with 400+ open psi will keep the roller lifters VERY stable thru 6500+.In fact, the builder has run the same setup thru the traps at near 7000 rpm. Billet with a decent spring. )
It must be a COMP cam yes? The only folks I know that "half-ass" their rollers. But they will work, only gently and DON'T rev that thing; it WILL float with their recommended springs.
PS just an FYI, many folks here run the GM HO502 "takeout" cam in their 454's. Actually "fits" really well! I might prefer the ClaySmith "oem head" BBC roller, but it will cost more. I use a tried and true ISKY cam. Costs more yet.
This is what a roller cm ought look like..... I mean BLACK IS BEAUTIFUL! ...... for flat tappets, not rollers.....