Ok all steel crank motors were drilled for the pilot bushing whether they were auto or not, didnt mater, after 73 all cranks were left alone unless they were for a manual car then they got drilled. so 72 and older your alright. the 383 should have it done already. if you look at the back of the crank you can stick your finer all the way in to the 2`nd knuckle. if its not then you wont go past the first knuckle. If you have 1 that isnt drilled out circa 73 later, you cut 1 1/4 inches off the end of your input shaft, then using a grinder reround the end of the sfaft to de bur it. the pilot bushing deal is this, they found that the pilot bushing for a 88-94 dakota pickup manual trans which is a roller bearing type bushing works on the 78 and later motors, for performance app. it goes in the end of the crank on the recessed area and you just drive it in till it stops, then the input shaft fits tright in it. I put 1 in my 4 spd super bird, and then my a-12 bee 4 spd. they work well. I have also done the nubb job on stuff too. and an 1 1/4 " gets it right in. hope that this helps.