Ech what Waldo said. If not 4 link, maybe just an aftermarket rear suspension from TCI or RB'S.
Those stock springs will be a very weak link for that HP.

1950 Chevy p\u 3100. lt1 Corvette powered.
Owner\ autoglass unlimited/Ultra Clear Body Shield
Cowboys creo: taste your words before you spit them out
http://s202.photobucket.com/albums/aa180/getm24_2000/