FWIW.. if you are looking to budget build it..
Hit a JY and
-Snag a 2000+ Monte front and rear sway for ??? $10 each? That's the GMPP bars.
-Bring an 18mm socket and long or breaker bar with you and snag the big washer/cup looking thing that holds the subframe bushing via the bolt. That's what ZZP sells as an anti-pogo washer and they work great.
-Snag caliper brackets from either a new monte or a Park Ave..those are the larger rotor brackets. Or find an F body from 98-02 with the aluminum calipers.
-While you are at the Monte/Impala section look for the beefier drag links (Impala police car for sure, some Montes)
-If the price is right, snag an aluminum subframe off a Monte/Impala (it's not better except in weight IIRC 20lbs difference) My local yard charged $50 or $75
Save your money for the lateral bars, although I was able to get a screaming deal on all six bars and wouldn't have wanted drag bars any less than what I got for the lateral/toe.
KYB GR2 Excel with vogtland springs, and 245/45/18 buick lucerne super rims.