Yes , the older OBD I vehicles gave 2 digit codes. The later years provided 3 digit codes.
I think you are missing some of the procedure that explains what is happening when the codes are started. There are a few blinks to tell different things before it starts giving codes. Once it starts with the codes it goes through them once and you have to be alert to copy them fast. If you miss some , you need to turn the ignition off and start again.
I really suggest you invest in a code reader, it will make the process so much simpler and easier to see the codes. You don't need an expensive one , just one that will give you the numbers
I believe you have a 1995 with a 3.0L engine (U) which I believe is a regular 3 litre 2 valve engine and not a SHO engine. Is this correct?

 

It's the regular 2 valve push rod motor.
I have a scanner but it's OBD2 I couldn't find anyone with OBD1 scanners.

I'll do some more searching. (I don't do ebay)