Hypethetical question as I dont understand offsets properly.

possibly putting some 17x7" rims on my 86.

with an offset of 40 (+ Im assuming)

How will these sit in regards to the guards.

ie: I want them flush with the guardline (not sticking out) will I need spacers?

(Im guessing I will)

and will the wheel studs be long enough?

(at the moment I have 16x8" rims (dont know the offset) but they are almost flush with the guardline.

If you can answer this then your a champion.

cheers