Those engines are not performance engines. They were designed to be work truck engines and it would be a waste of money swaping one of those it. You best bet (it the money and power department) would be to swap in a stroker Windsor engine. I built a 414 CID Windsor for my ranger that should make over 550 hp, and it didn't cost much at all. There is a link in my profile.
If you want serious N/A power (over 700) you can go with a big block, but you will need to lose your power brakes or go with hydroboost system from a newer mustang.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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