I have a 69 428 (YH block) with #46 heads and a Rochester Quadrajet, that turns. Anyone have a feeling what a motor like this is worth, say as a replacement for someone wanting to power up their bird? It currently sits in a 67 GTO that is a project car, but the GTO would be better served by a closer date coded 400 IMHO. If I was building a killer street machine I would probably keep her. Seems like a hot motor for someone's '69. Any opinions would be cool since I may market this engine soon.