Can a small block timing chain jump a tooth?

it could have jumped a tooth, not uncommon on the nylon timing cogs. Some cam guy could tell you where to measure split between intake and exhust rocker lifts to determine TDC, or very close. By the time you set up the dial indicator and mag base and look up cam specs, you could have taken the timing cover off and eyeballed it. Assume your gonna need a timing chain so may as well buy one before you get into it. If you find its something else, no harm, you got a spare. Consider a MP chain tensioner. Many poo-poo it but I think its a good upgrde to help cam timing stability and reduce chance of a chain 'whip' in the future that could cause another jump.