Suffix code on that Chevelle is CRW.
CRN 1970 Chevelle 454 360 Mt LS-5 HP
CRQ 1970 Chevelle 454 360 TH LS-5 HP
CRR 1970 Chevelle 454 450 TH LS-6 SHP
CRS 1970 Chevelle 454 450 TH LS-6 SHP, alum hd
CRT 1970 Chevelle 454 360 Mt LS-5 HP
CRV 1970 Chevelle 454 450 Mt LS-6 HP
CRW 1972 Chevelle 454 270 TH LS-5 AR
I dont know?
