Damn Thermoquads.

I've rebuilt at least a 100 of them. I've had good luck with them. Just rebuilt one last week for a 71 340 Shaker Challenger. I once bought a TQ at a swap meet, where someone had put all four external links in the wrong place, and tried bending them to fit!
I have not been into the "new" Street Demon, yet, but it looks like they did away with some of the best features of the solid fuel TQ's.