What ET should my Duster be running?

You could be down 40+ hp with that total timing number.

Fix the timing before spending any time sorting out other things. It's MILES off. It will probably like 35-40 total timing.

106 is roughly a 12.50. There is a ton more in it !
I was going to mention last night, mr crackedback here has a excellent explination of how to check and get your curve set properly, do a search on that, and FIX the timing!