That is probably about right if I was to guess I would say 18.5's-19.5's stock, but obviously I and the original poster are not going for a better ET, with a little bit of work and time to put some more modern type components on these motors you can have an even better daily driver than the car already was. If the carb/cam wouldn't have been junk and the previous owner hasn't destroyed both manifold attempting to put a dual exhaust on the car I may have just left mine alone, I doubt it, I am a tinkerer by nature