67/68/69 cuda dilemma

I found a heat gun and scraper work great for undercoat. Also if you have air grinder with wire cup on it, you heat it and use the wire cup. It takes every last ounce off.
That works, and I have done all that. but it is messy as heck with all the dust from the wire wheel. Plus ya better wear a respirator or your gonna be blowing charcoal briquettes for nose boogers for days. Soak it well w WD40, wait a day or 2, start scraping with a sharp edged scraper with some big sheets of paper underneath . Most of it will practically fall off in chunks in most spots. Anything that's still attached, reapply WD40 and wait a day or 2 and try again. All of its messy, I find the wd40 method to be less messy.