i am in the process of trying to get everything ready to take the 400 and 203 out of my 79 k20 and go back with a 700 and 205 . i have already bought a 205 that was out of a 69 model it has the fixed rear flange which is what i want but the front has a yoke. i need the flat flange and have found out that there is not one made for it. so i will be hunting a later model 205. also i am getting a 700r4 from a 88 blazer from another member here. i am going to take it out and have a different shaft put in it so i wont have to use a spacer and i found a shaft thats in the for sale section but its out of a regular turbo 350 i already have a junk turbo 350 out of a 80 c20 so are these shafts that are in a regular turbo 350 the same as aftermarket ones ? i am really haveing a hard time coming up with the rite parts to do this swap so any help would be welcome.