That part we already did. We made sure the truck was at TDC on the compression stroke by locating the mark on the crank housing, behind the pulley, and lining it up with the TCD line when the #6 valves were both slightly open. (the passenger side valve cover is easier to remove than the driver's side). The truck didn't fire up right away, so Greg turned the distributor in between crank attempts. It finally firied right up. I think he just turned the cap in relation to the distributor body. I can look at where he has it lined up later; I was dark outside, and I had previously marked its location relative tot the intake manifold. I wonder if just a few degrees made the difference.