Which kit?

What would these ways be? Im not looking to RACE ONLY, but to lighten the car as much as possible because Like I said, The motor is done and theirs no ability to make it faster unless I lighten the car up and raise the power to weight ratio.

If your intentions are to race this car seriously, and I mean drag race, the summit kit or the ebay kit is probably are the wrong products to be using.
I would suggest a Wilwood kit or a Strange Engineering kit that use better and lighter components and sell for under $500.
There's alot of better ways of spending $500 than on disc brakes or aluminum driveshafts to make a car go faster IMHO but again its your money.

Well there is many way to lighten a car but here's a few idea for you

Replace the hood, trunk lid, front and rear bumpers with light weight fiberglass replacements.
Lighten the front fenders and doors with metal removal.
Replace all steel bumper brackets with light weight aluminum.
Remove all unnecessary bolts and washers
If this is an occassional street car, consider lexan windows.
Aluminum radiator
Remove windshield washer tank, heater core and hoses, wiper motor and linkages, radio and antenae.
Consider light weight seats and removing the rear seat.
Remove door panels and replace with aluminum.
Move battery to rear of car and replace with light weight batteries
Gut the tail light housings

And this list could go on and on..

One thing to remember.... You likely won't find a hundred pounds in one spot waiting to be removed but if you look in 1600 places

Hope you get the idea