Break In Disaster????????

Back up the bus, Gus. First prove the theory.
What are you torquing those bolts down to?What kind of spring pressures are you running? And what arm-ratio?, And what wall thickness?
Remember, I put mine on as a prevention, cuz I like to run pressure, cuz I like the valves to close when the cam tells 'em to. Especially at 7000plus rpm.I hate lifter pump-up. And with a 4spd,no rev limiter (cheapskate-broke actually), and a factory type shifter, missed shifts are fairly common.And so I do everything possible to prevent it. Within reason.
And no my little 230* cam doesn't need to go to 7000plus. But it does. And it's still pulling(Hughes cam). And it sounds awesome! And so I let it go there and hang it there for a bit, letting the tires catch up. Then I shift and do it again!
But ok, mine are blue-anodized aluminum anvils, and I bought them out of the Mopar Performance catalog about 15 years ago.I have no idea who manufactured them.

My factory service manual lists those bolts as 3/8-16 and 30ftlbs. IIRC those are 5/16 bolts aren't they? Ummmmmmmmmmmm maybe not, it's been a while. A 5/16 bolt would be 15 ftlbs.