A limited slip rear was an option on the 87. The Factory rating was 160 HP. There was a optional upgrade known as a Turbo Plus Kit which raised the power up to 180 HP. It does not have a easily chip-able ECM but it can be easily modified to 200 to 250 HP. The 87 was unfortunately fitted with the so called K Block B230FT.
It had smaller journals and rods than the early B21 or B23 motors. The best engine for mods is either the B23 from 84-85 or the 93-95 B230FT. If you interested in modifying your car you may want to head over to www.Turbobricks.org
These guys are the best source for information on modifying the 700 series.
Here is a link to an article on modifying the 700's to wet your appetite
Staged 700 mods