Flat tappet to solid roller...

I'm no expert for sure but I run a Comp solid roller in my Eddy headed,10.2:1 comp ratio 470". It's just a street toy but the cam has performed well and I like it's manners on the street. It idles decent at 900 with about 12" vacuum. It's pulls good from idle up to 6k with a ton of midrange(4sp/3:73 gear) It made north of 420 rwhp at 5500 rpm. I'm happy for a shelf cam. Maintenance has been minimal but I don't put a ton of miles on it. I use the recommended Comp lfters,Comp springs,Comp rockers and Smith Bros. pushrods. This cam:

COMP Cams: Xtreme Energy™ XR280R; 2000 - 6000 RPM Range