I went back and reread this thread and I made the discovery that you may not have a new head like the one from OG posters instructions.
you may have the same problem I had,see requite below, or there is something going on with your tensioning sequence.
"I to was having a major problem getting my timing marks lined up. Poster T89 was having the same problem with one of the marks being a half tooth off. Of course I read the post after I already put everything back together with the crank half tooth off and the cam mark dead on. When she would only come close to getting started by rotating distributer counter clockwise. I knew right away it was a timing issue.
Second time around I set the crank mark dead nuts on and the cam mark was half a tooth clockwise past the cam mark. To compensate for the cam mark being off I had to pull the distributer and retard (clockwise turn) one gear tooth to get enough for an adjustment on the dizzy."
1988 Trooper LS ,4ZE1,Aisin Autotrans, manual hubs,cruise control
1991 Trooper LS 4ZE1, Manual,stock