you have the right pan dude. it the oil pump cover bolts that are the probl;em. this happened w/ my stock 83 gt oil pan & a used 92 oil pan & they were both the correct pans, i am very familiar w/ oil pans etc.... use the smaller bolts from the stock oil pump. its 2 minutes worth of work, you dont need to remove the pump from the engine & its a hell of alot cheaper.
good luck bro-