QUOTE(young55961 @ Mar 5 2019, 08:50 AM)
Are the part interchangeable ? Or they are different every year?
For the most part each year is different, although MYs '75 and '76 are the same some variations for country of origin. Mixing and matching some components will make life hell trying to tune the bugs out.
If your aim is exact restoration than the goal would be a MY '75 D-Jet with matching catalytic converter exhaust system.
Or
If your aim is a peppy 4 with the best D-Jet system you would look at something like a MY '74 D-Jet and gather the components for that system. Add the 123 Dizzy for the D-Jet, SSI 2.0 heater boxes and a bitchin muffler, you should be a happy camper.
Check out the panders section of the rennlist.
As stated above this is all dependent on the engine having a FI cam.
If you need some help with tuning I am in Sylmar, I can adjust the MPS for higher volume engines.