distrutor is really irrelevant. the difference is in the distributor drive on the camshaft, it's different over the years with different variations of the engine(20R with electric fuel pump had a gear that was longer that didn't use a washer or fuel pump cam lake later engines), i think dual chain/single chain might be different.

however, any distributor from a 20R/22R/22R-E, any year will work fine. just make sure it's got the correct type of plug(round vs square) for the ignitor, or splice yours on.

'79 sport 4x4 longbed <img src="/forums/images/graemlins/smile.gif" alt="" />
20/22R hybrid with EB's OS valves, 268c cam, offy intake, weber 32/36, thorley header, 5 speed swap, 34" LTBs, downey 3" springs, marlin hysteer, 4.88s and locked

'91 4x4 shortbed
22R-E, W56, the dd!