Hello To All,i Have A Few Questions I Hope Someone Might Answer. The First Is,my 350sbc,at Around 5200rpm The Engine Stumbles Very Bad.as Soon As I Upshift It Pulls Super Hard Until 5200,then Starts Again.everything Is New On The Engine,carb,heads,dist,coil,wires,plugs Gapped .035. Next Is My Car. Its A 78 Nova 2 Door.on The Pass Side Rear On The Bottom Of The Leaf Spring Pack There Is A Piece Of Metal With 4 Holes In It.the Lower End Of The Shock Bolts To It Also.i Was Told It Is Called A Shock Plate.my Question Is Where Can I Buy A New One? Gm Told Me They Were Discontinued.i Would Like A New One If Possible,but If This Is Not Possible Any Ideas Would Be Greatly Appreciated. Thanks In Advance For Any Help! Nick