The two powerheads in the first picture are just standard production V8. 3.6 liter 1985/86 and 87. 1988 and up 4.0 liter.
The second picture is the pure racing V8 used for the first time 1981. A completely different animal.. Lots of people believe the racing and production powerheasds was the same..
Not even close..
Attachment 470579
Attachment 470580