Hey guys!
The 85-86 crank is Totally different from the 87 and up years.
However, you can do a Long Rod motor on the 85-86 motors using the 88 rod.
But you need to use the 85-86 lower rod bearing (preferably new).
You will need to have a 8mm spacer plate made up (Cometic Gaskets) and 2 base gaskets (1 for the top and 1 for the lower of the spacer plate.
I did one and it runs really well.
Of course it doesn't compare to a modded 87 and up 250 but, it is a nice set up.
and runs very well, reliable too.
Joe