This might help you out a little bit. I had the same question. I am also not 100% sure it is correct but I can believe it. http://phystutor.tripod.com/stang/engines/50.html
stock base timing is 8 degrees before TDC
The Ford 302 has two different firing orders depending on the engine. Standard Ford 302 = 1-5-4-2-6-3-7-8 Ford 302 HO = 1-3-7-2-6-5-4-8
One way is the firing order. The 302 HO has the same firing order as the 351. So, if the firing order is 1-3-7-2-6-5-4-8 you have an HO engine. If the stock manifold is on the engine, it will say "5.0 Ford HO". The exhaust manifolds were factory tubular headers. They had roller cams.
5.0 ho is 5 quarts of 5w-30 if stock
KAA 50-50-50- - 2012 Ho Ho Hobo 1-1 was released on: USA: 1 October 2012
165 kw or 221 hp
== 215 net horsepower, 285 ft.-lbs. of torque
The Ford 302 H.O. firing order is the same as a Ford 351 engine. It is 1-3-7-2-6-5-4-8. It is totally different from a standard Ford 302.
I believe the 1995 Ford Mustang GT was rated at ( 215 horsepower from the factory )
HO gap is .054" =]
Take the distributor cap off an crank the engine or turn the engine by hand clockwise and note the direction of the distributor rotor.
The Ford 302 cubic inch H.O. (High Output) engine was mostly a muscle car power plant. H.O.'s had upgraded intake system and a performance cam.