The e7 heads are what comes with the 5.0 stock unless yours was an LX 4 cyl with a v8 swap done and an older motor/newer heads
Good luck with the car!
__________________ 1992 Mustang LX hatchback.. 1 of 542 black on black 2003 Regal GS - the beater/daily driver - somewhat stock. No its not a mustang, at least it's blown.