slow/ fast / respectable?

DON'T WELD YOUR SPIDER GEARS!!! A new ring and pinion is $185. A suregrip is a little more. For $100 i use a spool, but I drag only. Just some completely of the cuff estimates for ya as I can see your feeling the dragstrip bug. A very well thought out $1000 should get mid 12's . Every tenth after that will coast another $1000. ( reliably)
I could put you in touch with my son who is a mechanic there in Denver and often frequents the dragstrip there with friends and family. He's pretty familiar with my duster I'v sent for him often to come drag race it and work on it with me. It would be good for him to help work on a Mopar anyways as he will be inheriting mind in the next couple years and be up there at the Denver drag strip drag racing with you..