I realize that you probably have all the information you need, but the 1999 Nascar Edition is just a graphics package that replaces the Sport package decals, etc. I've got the Sport and the dealer I bought mine at had two Nascar editions on the lot. One a white supercab with a 4.6, the other a red regular cab with a 5.4. They are not the same as the 1998 Nascar Edition which included different wheels, yellow outlined letters, and other various performance items. The 1999 is just a looks package and can be had in any combination that the Sport package comes in. Hope this helps.
1999 Ford F-150 XLT Sport 4x2 SC; Black, Med Graphite Interior, 5.4L, 3.55LS, 17" Wheels, 275/60 Tires, Tonneau Cover, Captains Chairs, CD Changer, Heavy Duty Electrical and Cooling, Nerf Bars, Rhino Liner, Tinted Windows