What was the correct fan set up for a 68 340 with AC?

I was just flipping thru my parts manual. I dont see a spacer listed for a 340. I see 1 fan listed for a 68 318 and 340 with ac. Its 7 blade with 2.25" pitch and part# is 2863215. You say you have a MP fan?? So not the orig fan?? Maybe that is the problem??