any difference?

The 86 mustang engines have no valve reliefs in the pistons. As for the truck engines I have no idea if they are built the same for the 86 MY.
 
The HO uses a roller cam with a 351 firing order
the non HO uses a flat tappet cam with a standard 302 firing order
passanger cars like Grand Marqis and crown vics have a roller cam with a 302 firing order.

most of the HO 302's have forged pistons
 
The HO uses a roller cam with a 351 firing order
the non HO uses a flat tappet cam with a standard 302 firing order
passanger cars like Grand Marqis and crown vics have a roller cam with a 302 firing order.

most of the HO 302's have forged pistons

x2 Believe 92-93 Mustang had the hyper. pistons in them.
 
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