68 Vette 427-435 crank pulley
 

Can anybody more familiar with Corvettes tell me the correct number for the crank pulley for a 1968 427 435HP engine. I've come up with 3921923 or 3899660. A little out of my wheelhouse. Any help would be appreciated. Thanks

I am coming up with 3921923 BM. Shows 68-69. I actually have a real nice one if you are in need.
I also have an NOS part, however the NOS item has the part number but not the "BM" code.

A local guy has the 3921923 BM, but I questioned if that was the correct one. He always treats me right so if we can confirm that the correct one I'll just get it from him. Thank you for the offer though.

It is listed as correct in an older GM Corvette parts catalog.