
I attempted to grind down the caliper and bailed when it seemed like it might be too much - however, after I removed them from the car I suspect I may yet be able to get them to work.
I do, however, have a set of rebuilt stock calipers which I decided to revert to for this summer. This allows me to baseline the performance of these while also moving forward with a minumum of hassle now that the season is upon us.
I will be upgrading the entire braking system next fall with parts from a 1978 Eldorado I bought last weekend for the rear disks and the Hydroboost hydraulic power brakes. Thus I think I will make another attempt at that point given that I already destroyed one caliper. My sense is that they can be shaved down enough to work but you will need a strong constitution to accomplish this with more than $300 worth of parts...

So my current recommendation is that this be considered unproven and not a valid solution for most folks. I can also say that simply painting the cast iron calipers results in a signficant visual upgrade when combined with the chrome wheels...
I will now take myself out back and spank myself for having made the original post without complete verification...
