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To put it simply it's either spark, fuel or compression. If the timing belt is okay (not broken or timing marks don't line up) and you have spark, you need to make sure you have clean gas and not water (from condensation) or air being sprayed out the injector nozzles. Try using quick start spray or even pouring some gas down the trottle body and see if it starts. If it does then check the relays, pump and lines. I've seen pin hole leaks in lines that caused symptoms similar to vapour lock. Check the Main EFI relay (it's under the dash near the brake pedal) they usually stop working when the car is parked in the hot sun. Sometimes leaving the doors open, or pushing the car into the shade so it can cool down, will get the car to start again. I would get a distributor and a Main EFI relay from a junkyard. Because it's too expensive just swapping in new parts, and it's always a good idea to keep a spare distributor around as they are known to go bad on old Integra's.
Some questions you need to know are what year head is the LS. Did you use the LS Intake manifold and throttle body. Problem is if you didnt use a OBD1 LS and it is OBD2 or OBD0 The Throttle position sensor wont allow the engine to start. Same with the Distributor, because your crank angle position sensor is in your distributor and a OBD1 ECU can communicate withe OBD0 or OBD2
If it is all OBD1 Then I would do a compression and Cyl. Leak down test.
I know that early 90's Honda's had problems and in fact a recall on the distributor. Might want to replace the distributor. Inside of the distributor is a part called the igniter which is the ignition module and that is what normally goes out. I cannot remember if you have to replace the whole distributor to get the igniter or if you can just replace the igniter itself. Has been a few years since I have worked on one. hope this helps but if not please contact me. I'm not sure about the drive light flashing thing though, new one on me.