Sorry for dragging up an old thread...I have a 97 GMC K2500 with 7.4 Vortec and I'm having a hell of a time putting in a new dist. and I hope you can help since you wrote such a great article at gmtruckcentral.com...I have the two piece aluminum intake and regardless whether a rotate a tooth one way or the other I can't get the dist. to line up as is recommended in every manual, book, ALLDATADIY account and online search...I can't even find images on google that show how the dist. is clocked in relation to the intake. Also, what is the second timing mark on the bottom of the timing cover represent? (approx. 5 o'clock position) I replaced the intake mani. gaskets, injectors (new gen. bosch from 50motorsports) and new dist. from Accel (billet alum. and brass contacts) and I'm having a hell of a time getting the truck to run right...keeps throwing 0300 and 0305 misfire codes then clears but runs crappy with terrible idle and no power when in gear and I've read as many articles as possible but none reference my engine/intake combo nor can I find anything about the second timing mark on the timing cover. Any and all help is greatly appreciated!!