The way I would go about this is to leave Cosworthtax out of the list, they brake & wear just like other quality components.

257 cases ( or short block new in box with non heat treated crank )
257 non heat treated crank > send to Tony knight at Knight racing motors and get re oil phased.
Heads sent to Tony and ported with 1mm larger valves, HD valve springs & retainers

Quality pistons & rings ( will find post on what rings are used )
Quality con rods & quality rod bolts
Torque plate honed block
ACL race bearings
Number 11 oil pump, ported by Tony & PRV set correctly
ARP casing studs
ARP head studs
Killabee Larger sump, baffle plate , oil pick up
metal head gaskets