rod length for 3.78 stroke crank

parts breakdown so far

-SCAT billet 3.79 stroke crank turned down to 2.100 journal size (use to race midgets/sprint cars, left over part)

-mopar aluminum comando heads w/ w2 intake and exhaust ports cut for 2.08 1.60 valves

-w2 m1 intake ported to the heads

-r3 block 9.6 deck

-mopar 50mm ugl cam

the part im debating on is, a freind is offering me a set of olliver chevy 6.125 rods which mean to run them the deck would need a considerable amount of material removed. OR do i buy longer rods and save the machining costs. SCAT has a 6.200 rod in the 2.100 journal size for around $500 with the arp 2000 7/16 bolt upgrade.

anyone have similar builds they can share their specs on?