The GMC 305 V6 engines are a different configuration, than their sbc counterparts and the motor mounts & frame-to-engine perches are different on the V6 engines, than their sbc counterparts. Additionally, the 4x4 frame-to-engine perches are different than the 2wd counterparts. You will need V8 frome-to-engine perches from a '63-'66 Chevy K10 or K20, if you want a direct bolt-in application. Otherwise, you are only limited to doing what your skills or pocketbook will allow.
