DFI? I hope you ment EFI. 70mm TB is more than enough. 24lb injectors are more than enough. You'll need TFS pushrods and 1.6 rockers. You can use the stock valve covers and the stock cam if you want. Good luck, sounds like a good combo.
Skyler
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-1989 Saleen Mustang #406-
TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20.
12.54@107.4 Motor
1.69 60'