Upgradability is superior N/A to the 4.6L SOHC, probably a little inferior for forced induction.
Problems are pretty much non existent. The trannies are a little weaker (supposedly), they don't respond to cams real well a lot of the time.
Performance is slightly superior to your GT stock vs stock.
Durability of the 5.0 (302) is proven for the last 35 years. They last a long time. Both the engine and tranny should fly past 100k with no problems.
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