boost-decent head gasket & copper spray.
Revs... - 250s dont like revs... but they will take it.
Resize rods with ARP rod bolts, balance, ARP Flywheel bolts (same as Clevo), Decent harmonic balancer, increase oil pressure (heavier relief spring), ACL race series pistons and get some head work done with a decent cam to match. May be worthwhile in using 200 conrods as well.
Also 250s dont typically rev, because the head runs out of flow. No point in revving over 6000rpm with a decent cam. Just wind a heap of boost into it.
