Another stupid question. Once you align the two marks on the timing chain at 12 o'clock and single mark at six on the crank gear(old cam still in truck at this point), but once I've aligned all timing marks properly. How you position thr new cam to the exact location the old one was sitting at before bolting sprocket back into new cam? Also the correct steps to take everything apart from the old cam prior to actually pulling it out of the block. First time ever working on hemi engines and first time in 20 years working on any brand motor. Any help much appreciated. I don't know my much which os why I'm here.