Borrowed a puller from a friend, MAN that thing was on there !! It was all my old Ingersoll-Rand 1/2 inch tire gun could do to get that thing loose!

It looks just like the top one Glenn posted, and the part # is 10224885, which seems to be the balancer for 1996 and later Chevy trucks.. The bright side is it came off with no carnage, although I'll be damned if I can see anything wrong with it...and when I ran the engine with it on, I did have the center bolt pretty darned tight.
Now for another (probably stupid) question- I don't have a lot of money, it's taken me 5 years to get this far, but I do have access to drills and grinders and lathes, etc...could I make a spacer, that fits inside the lip of the pulley, with the 3 small holes and the large center hole? I can make one of those a heck of a lot cheaper, than I can afford 150 bucks for one of the fancy racer specials... and I've found the replacement balancer for under 40 bucks.. so i could get away for under 50 bucks, which would make my poor, understanding, long-suffering wife a lot happier, too, and we all know if mama ain't happy....