I'm fairly certain that most all of the bolt on suspension parts are Stock class legal.
Upon further review of the current rule book, you are sort of correct, but if you look in the traction bar section below the rear suspension section, on coil sprung cars the front mounting point cannot be lengthened, BUT, traction bars or mounting brackets at the rear axle housing, bolted on, must not be below the inner edge of your wheel rim, so there is a HUGE grey area that allows the relocation of the rear of the lower control arm, not just the raising of the rear of the upper arms.
I know that the Southside Machine setup is Stocker legal, uses a relocation bracket at the rear lower arm, and fits within the "no heims" caveat.
You want to lower the rear of the lower control arms, I'm tellin' ya.
Although this picture shows a welded part, (not legal) you can get the idea of what you need to do.
