My truck is apart right now also, with the KDP being the cause. I used twelve extension magnets to hold the lifters up, worked great, I tried the dowels and they didnt feel right so I went with the magnets. Oh and dont forget to remove the lift pump, we were like "what the heck is holding the cam in?", then it dawned on me the lobe for the lift pump, and all is well now.
Also, if your getting a new "updated" timing case, then you also need the dowel pin, dont worry it cant fall out with the updated case. The pin goes in before installing the case. I forgot about the pin in the mad aggrivation rush, and didnt install one b-4 we had already installed the cam with the case in place. I used a drill and opened up the hole where the dowel goes, then I machined a dowel pin of my own that is long enough that when the cover is on then it can't move, plus I staked it.
Mikey