The CALIFORNIA EMISSION vehicles listed below with a 4.1 / 250 engine should have the 7 pin HEI / WITHOUT VACUUM ADVANCE distributor. AC Delco part # 88864755 or A1 Cardone part # 30-1677 ( https://www.summitracing.com/parts/aaz-30-1677 ).

dave w


CHEVROLET C10 PICKUP 1983-1984
CHEVROLET C20 PICKUP 1983-1986
CHEVROLET C30 PICKUP 1985-1986
CHEVROLET C50 1985-1986
CHEVROLET C60 1985-1986
CHEVROLET G10 1983-1984
CHEVROLET G20 1983-1984
CHEVROLET G30 1983-1984
CHEVROLET K10 PICKUP 1983-1984
CHEVROLET K20 PICKUP 1985-1986
CHEVROLET K30 PICKUP 1985-1986
CHEVROLET P20 1985-1986
CHEVROLET P30 1985-1986
CHEVROLET P40 1985-1986
GMC C1500 PICKUP 1983-1984
GMC C2500 PICKUP 1983-1986
GMC C3500 PICKUP 1985-1986
GMC C5000 1985-1986
GMC C6000 1985-1986
GMC G1500 1983-1984
GMC G2500 1983-1984
GMC G3500 1983-1984
GMC K1500 PICKUP 1983-1984
GMC K2500 PICKUP 1985-1986
GMC K3500 1985-1986
GMC P2500 1985-1986
GMC P3500 1985-1986
GMC P4500 1985-1986