I smell some serious money spent to spin a 493" to 7500 on a street engine . Titanium valve train , rods etc... I love a hot rodded MoPar RB !
I read all about it years ago. The original owner/build spent some coin on the car, built circa early-mid 2000s. IIRC, he built it to mess with his buddy's then new Corvette. I don't think there was anything exotic done to the engine, more or less a nice stroker kit, worked over aluminum heads and intake. B/RB MoPars have shaft mounted rockers, so they're more stable than a stud mount with high spring pressures and RPM. I've heard that a stock 413 is stable up to around 7K, but that's not really something I'm willing to test with mine.
Probably something like this.