front and rear susp setup for malibu?

I know there are theads on hear already but everyones combo is alittle diff. I have a 80 malibu 750hp 436ci sb going to spray 2 kits witch will total 350hp 100hp on the first hit and 250 on the second th350 trans with tbrake and 4300 stall 9in 4.11 gears rear susp is UMI dbl/adj upper and lowers autofab arb QA1 on all 4 corners right now i have moroso springs in the front/rear and stock spindles and A arms in the front rear tires are 28x10.5 it has a full int 10pt cage and i would also like to lower it a bit i know the moroso springs wont work well with the arms and arb looking at the other posts im looking a 14" 150lbs rear springs any advise would be great thanks guys