It doesn't take much of a driver to drive a 73 car right. The car should be a cakewalk to drive. If you put a slick on it you might get mid 15's. I had a fairly stock 72 Nova that went 14.93 once. All other runs were mid 15. Make sure you shift at the SAME POINT on each pass. I wouldn't load the converter and I would stage shallow to give it that extra little help. That motor should be low rpm torque, so don't expect to rev the crap out of it. Shift no higher than 5000rpm would be my guess.if driven right