Cam degreeing on a magnum motor

What's best to do it heads on or off? My high school bud has wrenched at dodge dealer over 20 years said just line up the dots but from what I've gathered here no no. Trying to do it right. Bought a Hughes double roller set and almost wonder if that stock chain isn't stronger. No timing adjustability but seems stout.thanks I think I have a cap to set on the top of the stock lifter. The summit degree wheel was glued to the destruction sheet with heads on instructions only so when it shredded I didn't really lose much