Another rim question

[osaltyone]

I am looking @ the Eagle 225 20x10 for the rear, comes in an offset of 2 and backspacing of 5.500 and 20x8.5 on the front, comes in offset -5 backspacing 4.500 or offset 8 backspacing 5.00 for my 84 with Dropmember and KP rear. Anyone have any thoughts? I want to make sure they will fit. I have 20x10 all the way around with 275/45/20 now and it is a pain to jack up the front end over 115psi everytime I need to make a hard turn.