This is a picture of my 35 as I bought it. I would say its about a 2" drop axle, the tyres are 4.50 -4.75 x16 on the front. the lowering job was dangerous as the secondary spring was missing ,was about 5-6" of just main spring on either side holding the whole thing up, the spring was curving up the other way like a bow!. The shocks where original and clapped out. As it was I could see marks where the wishbone has touched. Should give you a guide.
Also attached is how it is now with 5.50x 16 tyres , same axle, lowered spring [not reverse eye] and tube shocks, I wouldnt really go much lower if you want practical handling.