$160 shipped to the lower 48 in a Priority Mail Flat Rate Box.; Pretty sure I have another set around here somewhere

I have a set that came with some other stuff, I can see how they fit on a head

You asked this on FB earlier, expecting a different answer?

Somewhere upstairs I still have the magazine with the coverage (Car & Driver IIRC) of the Calliope, the G7-A and the Honker II (named after John Holman). Really great old articles with color cutaways and breakdowns of the engine and the cars like they used to do. The Can-Am Series was going big on engines then, like the 494, and they toyed with the Calliope

The Isky rockers are also pretty much indestructable, and have a hardened tip

Mark Artis has passed away

Around 1975, I was running around in my 69 Mach1 with a roller cam and headers etc on the 351 with 4.86 gears, aggravating the Camaro boys as much as possible. I pulled the 3rd member, as Cantrell had found me a set of 31 spline axles and was getting that together, so I put the stock 3.00 pumpkin back in. There's a long, straight stretch on Silverado Trail a few miles north of town, so one night with no cars around I let it eat- tached to 5700, a little over 140, and the top of the driver's window popped out, then the vacuum pulled the headliner down and snapped a couple bows, so the headliner came down on my head. Scared the dogshit out of me lol...

I have done it several times myself on stock setups and FT's- IIRC it's in the factory Shop Manuals. Helped a friend do one on a '66 Comet 390, took the two of us about an hour to put it back together in the shock tower car. His dad was a mechanic for a local trucking company that had a fleet of C800's with 391's and had done it many times