These conversion mounts and billet accessory brackets will fit your selected application-

GM truck 1973-87 4wd trucks and SUVs. K10, K20, K30, K1500, K2500, and K3500 including Blazer and Suburban up to 1991 with Gen 5 LT4 Supercharged balancer spacing. 

* Low mount A/C requires engine to be moved all the way forward and frame notching

* May require crossmember notch on driver side