will 350z disc brakes fit on an 87 300zx turbo?
if so how much work is it to get them on?

no
lots

Actually slicktop, yes you can install the 350z front brakes on a Z31 as it is a common upgrade for the z32 and since the z32 brakes are a easy upgrade to the z31 they will work as well.

Now this wont be a direct bolt on affair and you will not be able to run stock wheels but it is do able.

Here is the information for the z32 upgrade for the z31.

http://www.xenonz31.com/Z32brakeupgrade.html

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XenonZcar.com All the info you need, For your Z

thanks xenon, i'm just going to get stock replacement rotors. found a good price and a reputable place to put them on for me.