mech Roller vs Mech flat tappet cam Q

For your build you can get away with less expensive parts.

Under .650 lift.
Hughs lifters $250

Hughs lifters and Crane rockers
Crane roller rockers $400

Over 650 lift and 700 lbs springs
Comp lifters $1050

TandD rockers $1250


For your combo you should be right at the .600 lift to get 600 hp.
My 10.70's pump gas street car I'm running a Hughs .590 lift solid flat tappet cam at about 490 hp per Moroso's slide rule,so about 600 flywheel hp.

Total cost for the over .650 lift came in at just about $4300 including more head work.

I've lost 3 flat tappet cams in the last couple of years.

Hope some of this helps.