I personally would not use poly bushings they bind, make noise and they are too hard I had them in my last car and did not like them. I do use poly body bushings on the other hand I just cover them to death with synthetic grease to prevent them from making noise. I would recommend the heavy duty high durometer moog bushings the upper a-arm # is K6411 (that does both sides) the lower # is K6421 (that does both sides as well).
one thing you might like to consider for the front is the SCandC stage 2 kit which is what I'm leaning toward (
www.SCandC.com)
They describe it as
"The secret is the combination of the tall ball joint and adj. upper arms which markedly improves the camber curves and relocates the roll center. This means more grip and less body lean.
For cars that include a tall lower ball joint it further improves the camber curves and roll center height for even better handling. It also lowers the car .5”-.75” and moves the spindle and steering arm to a more favorable height radically improving the bumpsteer.
For drag racing it minimizes toe change under hard acceleration reducing drag and making the car much more stable on the top end. It can also allow more suspension droop for greater weight transfer and better launches."
I have all the kirban braces except the seat brace which I will be getting
my rear suspension has hotchkis springs, bilsteins, hotchkis lowers and edelbrock uppers with an ATR bar, I love it BUT with everything I have read I am considering an upgrade to the H&R bar, my front has moog 5660 springs, bilsteins, heavy duty moog bushings, 36 mm sway bar and an XH steering box with 245/50/16's all around. the handling difference from stock is remarkable, but like I said I am considering the H&R rear bar and the SCandC stage 2 kit to further improve the handling
a lot of people will tell you that you cant make a G-body handle that's bull $hit there was a mag article about a GM built G body called the FE3X that did 1G on the skid pad
all it had was
255/50/16's, 700 lb/in front springs, koni adjustable's, 1.5" front bar, urethane bushings, stock front brakes, fast ratio box, 3/4" rear bar and f-body rear disc's
a lot of us that like handling have a lot more than this in to our suspensions, could you imagine what they can do on the skid pad with a pro driver?