....i'm a little confused by the...question.....er......statement as well. The block is the same with all 302 windsor engines, except for when they came out with one piece rear main seals and the roller cam 302's came with taller lifter bores, but other than that the block is identical. The heads were also very similar through the years with the 302's with only a year or two where the 302HO had a different head (usually not better). The main differences lie in the type of cam, timing chain, and induction/exhaust that's on the car.
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previous name: 84stangLX
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT