I recently replaced the original (running) b230ft in my 740 with a built up b23ft. Ihad all the regular head work done, and i converted the head over to the old sensors so it would run with LH2.2 that was in my car. At this point the car still doesnt start. Between my father, a bunch of friends, and I none of us can figure out why it wont start. The timing is correct, we have fuel, we have spark, and compression itself is healthy. This is driving me insane. Ive been at it for several days. So far, weve found shorts in the wiring harness and fixed them. One specifically was the leads to the hall effect pickup on the distributor. ive replaced sensors in the head. ive tried different wires. i just cant figure out why it doesnt run even tho everything is there for it to run.