Few questions about sas

Im looking to do a sas on my 95 f150 4wd which has a six inch lift. It has 35 x 13.5 r15. Its got coil suspension up front and i found someone selling a late 70s solid front axle which os set up for coils and has the stock radius arms. I dont have a lot of cash to buy the aftermarket radius arms right off the hop so im wondering if i can use the stock radius arms with a 6 inch lift for now and upgrade later. Or do i need to drop my lift a bit to 4 inches to make this work? Also, does anyone know of a company in canada that sells the aftermarket radius arm kit? I believe the donor axle is from a 78. Its a dana 44.
Thanks in advance!