HELP! I am in deep crankcase oil!

[CivicTuner_Otto]

Theres the scenario:

I tuned up my 91 civic 1.5 DPFI AT with a used injector(car hesitated with acceleration, this used one fix the problem).
car idled a lil funny but ran ok.
I get up next morning convicted i should use the original 1 because it had better life on it.(the injector plastic tip was cracked so i glued).
car didnt start.
I put in the other one and nuthin happened.
i then put in the original one then after 15 seconds of cranking(max cranking @ 15 seconds) it slllooooowwwwlllyyyyy started to fire up.
After that, there was a knocking noise so i turned it off.
tried it 15 min later and it did start again but with the bad knocking, it was smoking like a chimney!

I pulled out the sparky's and they were all oil soped.

Please tell me this isnt the end of the road. this car has 82,223 miles on it, but i dont think the -before me- owners took care of it.

Ill take any advice, OTHER THAN JUNKING IT.

[HondaME]

so how's the engine doing? last time I had this happen it was a crack where the head gasket goes.... not good news :-(