i got a block with c8am 6015-b on it. I understand its a 68 block from mexico. but does anyone know from what? (mustang). And what the timing should be at. This site was the first site that came up when I plugged the # in. If wondering I aquired the block from a friend and it was bored out, bigger pistons and just totally rebuilt and never ran yet. and I put it in my 76 bronco. runs great got lots of power but want to time it right. aloha.