500hp & 550 ft.-lbs.???

Sounds about right, but I would ditch the stock cam and get something a little beefier (nothing too extreme)......also, you might want to price out a new rear and some slicks. You'll need the slicks in order not to make 14 second runs at 125 mph (you'll be spinning all the way through 3rd). That's where the rear end will come in.....with that HP, you're sure to snap that stock rear.

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; 190 lb fp; FPR; TFS track heat Intake - 12.513 @ 112 mph (Pre-inj/fuelpump/FPR/intake)