Hi Greg,
the '84-'85 hot air driver's side header will fit on the '86-'87 turbo engine. All four years of production used the same heads (casting ...8445). The only difference is that the '86-'87 header had the U-shaped heat shields between the primaries. The '84-'85 version did not have these.
Also, the oil dipstick was located between the 1-3 primaries on the '84-'85 engine while it was between the 3-5 primaries on the '86-'87 version.
Depending what you choose to use, you would have to either remove the heat shield or use the later dipstick and tube with your combination all the while making sure the dip stick does not interfere with your MAF pipe to the throttle body. If you remove the heat shields from between the primaries, make sure you get some spark plug wire booties (insulators) for added protection of the boots. I'll attach a couple of pics for you.
Left pic => NOS '85 LM9 hot air engine. Right pic => NOS '86 LC2 engine