Yep, factory headgaskets were junk. When I was racing them it wasn't a headgasket...it was a 10 second fuse. I could do a lift-n-slip replacement in the pits, between rounds, with hand tools back then! For my street cars though, I run either an MLS or the Mopar Performance 006 (I think...there were two, one for cross-drilled heads and one for non-cross-drilled) headgaskets and ARP 11mm head studs. Haven't popped one of those yet. Never did studs on the race cars though, because they prevent the lift-n-slip job!
I'll never forget a day at VIR in 2001, a Carroll Shelby day. The Man was there, in a Series 1. There were Cobras; Mustangs; and of course a ton of us Dodges. I had my modified 89 CSX-VNT that I had pulled the VNT25 out of, and replaced with a TEC 60-trim VNT turbocharger as well as a ported head, and ported/ceramic coated intake with a 58mm throttlebody (stock was 46), a set of Mopar +40% injectors; a Grand National 3BAR MAP sensor; and a custom calibration. There was a "parade lap" that all the owners could take part in. "NO PASSING, NO RACING, this is for SHOW ONLY" was the repeated, and LOUD, admonition before the green flag flew. On the back straight I'm doing about 90 and my car rocks side to side as Carroll FLIES past me in the Series1.
Well....
Downshift, and GO. At the end of what turned into a 5 lap free for all, it was Carroll out front; every single Dodge right behind him; then the Mustangs and one or two of the Cobras bringing up the rear so they didn't hurt anything. Us Dodge boys went back to our "area" which was outside the main gate in the visitor parking lot (unlike the trackside spots for the Mustangs and cobras) and fired up our grilles and started talking and bench racing.
Then, Carroll shows up. He'd climbed out of the Series1, unzipped his fire suit to the waist (it was about 103 on the track), grabbed a water and a golf cart, and made a beeline for us! He hung with us for 2 or 3 HOURS (the Ford guys were PISSED), looking at all the cars, telling stories, signing cars (including mine), and taking photos with us. It was a BLAST. At one point, he looked under my hood and got a quizzical look. Called his engineer over and said "did WE put that in there??" talking about my TEC S60 turbo. I said "nope, it's a custom" and gave him the info and specs, and the name of the guy who built it for me. Last I heard, he'd called the next day and ordered one for one of his cars - I believe his '86 GLHS Omni, which he had running with a Cosworth 16v head (not the Spirit/Daytona R/T head, which was a Lotus design).
THAT, was a great day!