Determining original bbc pulleys from aftermarket

[Day2_69Z]

I assume your Chevelle is a Solid Lifter BB ? If So, AVOID any and ALL REPRODUCTION DEEP GROOVE PULLEYS especially with a Solid Lifter or any Hi-Perf 400+ H.P. engine. Those repops are JUNK, DANGEROUS & A TRAGEDY WAITING TO HAPPEN. THEY BLOW APART UNDER RPM,,,,We had a Friends Z/28 in to repair after a crank pulley came apart.......$15,000 Later in repairs. They are imports of questionable metal, welds and craftsmanship. Need I say more?