Could someone please give me alittle information? Ineed the firing order for a 1988 5.0 HO. I dont know which one is right. I took the the EFI MAF off and put a edelbrock rpm intake along with a 600 holly. The chiltons I was using disappeared. If I remeber right, there were two different ones, One was for a HO the other was for a straight 302. There's been a few laugh's becouse my moter and tranny and rear end came out of a lincoln Mark VII, I hope Ill be able to shut there mouths for them. I would appreciate someone's help.