Greetings' I just picked up a complete but unassembled 140hp RB block...65-66 Corsa manual trans block. However it also has Yenko 22 and EX 10 stamped across the block halves. Any significance? or just someones' fantasy? Jim Briggs 65 Fenderwell AC cpe 65 "Eurosport" 500 sedan 66 266 Olds/Corsa in progress