Actually TFS makes heads, there are intakes, cams, etc. They are respond well, this guy on f150online has ported heads/cams/etc and is making 354rwhp thru an auto and running pretty quick!
"1999" F-150 XLT SPORT, BUILT 5.4, all  N/A.
   354RWH.P/392RWTQ (no tune, yet) on 8 cylinders/ 1/8= 8.4...