The '89 through '92's are considered the best for adding mod's. The combination of a stronger block, MAF, better heads, and forged pistons make these easier to mod and more reliable.
I have heard you can safely add a 50-75hp shot of NOS to these cars with higher fuel pressure.
FYI,
'86-'88 are speed density.
Have fun with the test drives! 
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'91 LX convertible , T-5, Centerforce Dual Friction, MSD Blaster Coil, FR 9MM wires, 13* timing, 1.6rr, ported/polished/milled stock heads, 1.94/1.60 stainless valves, March Performance Pulleys, K&N panel, 1"spacer, BBK shorties, 2 1/2" off road H, Summit 2 1/2" catback
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