road race engine...
I’d get all new high quality forged bottom end, from whoever that might be.?.. the guys on here will know. I think some companies also knife edge the crank, how effective it actually is, I don’t know. Never had one.. Solid cam, nothing hydraulic. Do all the oiling mods necessary, maybe get a blueprinted high volume oil pump from Precision Oil Pumps...
Look up B3RacingEngines, at sustained high RPM your rocker arms/valvetrain must be perfect. His kits will get you there.
Might want a 26” radiator, properly shrouded...
It might be wise to list the gear ratios in the transmission you are using...
I don’t know. I’d maybe even look for an R3 block. I always wanted to build an R3 engine.