Here's my 4.0L specs.
-91 short block, stock with the exception of an oil pan from a SOHC.
-95TM heads - ports just cleaned up & matched to the intake.
-Comp 988 springs installed with stock valves, locks & retainers(no machining required).
-Comp 422 cam & smith brothers push rods 5.55" long.
-Stock rocker assemblies with aluminum spacers between the rockers instead of the springs.
-Lower intake - port matched & smoothed around the injector bosses.
-Borla headers into a single 3" catless exhaust.
With the factory tune, on a Mustang dyno, this combination put down 174 rwhp & 221 rwtq. It has a nice broad torque band & even with 4.10's still gets 25mpg on the highway
Here's a link to it as TOTM on RPS in 2003 http://www.rangerpowersports.com/totm/?p=10