[Too Many Projects]

I've been attempting to find a 3869978 deep groove crank pulley to run on a 1970 454 engine with swp and PS in my '66 Chevelle.

I see HBC has one made in the US. No mention of any restrictions.

Camaro Central lists the same appearing pulley, made in America, but with a disclaimer.
Made in the U.S.A.

*Important Warning Concerning Crankshaft Pulleys. Stock replacement, aftermarket stamped steel or cast iron pulleys are not designed to exceed 400 horsepower or 6000 RPM. Using reproduction pulleys on engines in excess of these limits may result in catastrophic disintegration of the pulley causing severe damage to the engine, cooling system and body parts. Camaro Central assumes no liability for damages caused by improper usage of pulleys. Please be sure to install the pulley properly to avoid damages that could occur from improper installation or exceeding the recommended RPM limitations.

Is anyone running one of these pulleys ? Any experience with these aftermarket parts is welcome. I don't want to end up with out of round or inferior crap that is going to blow up at 6,500 rpm.
Thanks, guys