I recently insalled a rebuilt 283 in my chevy. ive had a horrible oil leak and have been watching pressure to keep from damaging the motor. recently though the car has started "missing" on acceleration and backfiring through the carb...now i cannot even start the car as it cranks three times and fires...cranks three times and fires...could i have just jumped timing and if i cant start the car if the chain jumped will i see it at TDC? HELP!!!

thanks,

rob