302 H.O. and 351 Windsor small block- 1,3,7,2,6,5,4,8
All other ford V-8's- 1,5,4,2,6,3,7,8
The only difference in an H.O. 302 and a non H.O. 302 internally is the camshaft. Just use the correct firing order for the cam you have. They will interchange. Just remember That ALL '85 and up H.O. cams are roller cams. '84 H.O. and most other 302 cams are not.