Fire and ice, if you will, has been the accepted method for ring gear installation for decades. I've done it successfully on a number of flywheels over the years. I theorize the sheer size of a 427 flywheel is the problem, it's BIG at 15 plus inches.
I did consider buying a new light weight wheel, but I'm happy with the one I got. Performance is outstanding, a ring gear is only like $30, about the same to have on installed. My current one is balanced not only to my motor but to my pressure plate/clutch as well. The clutch has about 7000 miles on it, I might consider replacing the disc while (whilst?
) I have it down, but probably won't. It's working well and it aint that big a deal to pull the trans anyway.