What size tire are you talking on the 15x8s,I don't think your problem is going to be the control arms but will be wheel & tire size,I have 15x7 Camaro Rallys with 235/60 15s on them and they rub just a little at full steering lock both ways,that's at stock height on
my 78,on the 81 (signature pic)I have 15x6 w 3" bs and 215/65 15s which have a full 7 1/2" tread pattern and you can drop it on the bump stops and turn it lock to lock and it doesn't rub at all,there's only so much room to work with up front,be carefull and do a lot of measuring but I don't think you're ever going to get 15x8s to fit on the front of a Malibu with out rubbing no matter what kind of front control arms you're using,now if you're interested in doing fender flares and making a road race lookin kinda deal you'd
be in good shape except you'd need 10s or 12s on the back to make it look right,! Hope I helped!! KillerDave