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Your first step is to establish the cost of obtaining and installing a LSD in the car, then consider if the benefits are worth it.
OK - now my view on these things: they are great in straight ahead poor traction conditions, which usually means 'winter'. A drawback is that, when cornering, and applying throttle in poor traction, both rear wheels can break traction and the rear end will immediately and rapidly swing out.
I suppose this was the direction of thought for Volvo's engineers on the later 940's. Mine has an ALD (automatic locking diff), but it only functions below about 20MPH.
Given the scenario of good traction and sporty/aggressive driving with a N/A B23/230 engine, I can't see that an LSD would add much to your driving experience. The usual cam/exhaust modifications to that engine usually just extend the RPM range upward a little and add some torque in the mid-upper ranges. This comes at the expense of a reduction in torque at the lower revs, which is typically where the need for an LSD occurs. The only way I have ever been able to break traction on a N/A 240 was to rev it and dump the clutch from a dead stop. And then I only got a (ie: one) black stripe about 6ft long!
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)
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