will the hooker headers part number 6160hkr for a 1973 pinto v8 swap work in place of hooker header part number 6161hkr in a 1976 pinto v8 swap? difference appears to be on the right side header. I have already purchased the 6160hkr not knowing there was a difference in the two v8 swap headers. tried to install last night and they will not work. going to sale for $300.00 plus shipping. 6160hkr are for pinto v8 swap 1971-1973 pinto