Hey guys I'm hoping you can help me out here.

I have an '85 302 roller motor that I'm rebuilding. I'm having a problem with the timing chain set. It needs to know whether or not it's an HO or not. Thing is, I have no clue if it is or not. I assumed it was an HO if it's a roller and came out of an '85 mustang. I also don't have the original timing gears/chain unfortunately so I can't match part numbers. Here's what I do know. It's a 1985 roller block out of a mustang, with casting number E5AE. Can any of you help me out? Thanks! I need to get this beast back on the ROAD!!!