Mine is a 1602,1968. In order to swap the long neck for the short, you have to swap to entire rear assembly. The mounts are very different. I've done that on a 1967 1602. 2002 trans( fine spline) it all swaps ( driveshaft, guibo,ect). It's a fine upgrade partially because of the 2002 guibo. The so called " Frankenstein " drive shaft is tricky. But, I don't race the car. It was my work car( realestate) ect. I bought rolling shell and had access to every part used for all 1602's and 2002's. I built the car, based on what I liked aesthetically and functionally. So my input may be impossible for most at this time. Guess it is a " Frankenstein " car. But, drives like new(120,000) over the last 27 years. One of the best upgrades is a 320 radiator, another is a manual advance distributor with electronic ignition. The Weber 2 barrel is unbeatable! 4piston calipers on the front and big drums on the back. Big sways front and back. Bilistiens all around, Sthal header. My pedal box is from a 2002 as well,brake system and wiring harness. Interior is from a 1974( best aesthetically.) Rotary A/C compressor. These cars are masterpiece of engineering. Drive it till I die I hope! Peter Z