The side covers would have been the ones with the louvers in them. One of the front forks will have the caliper hanging off of it and the other might or might not have a mounting location for another caliper. The earlier ones did not have that mounting location - and are possibly desirable to someone doing a restore. That bike came with a smooth and painted airbox. You can get a nice repro from LPM. You can also get the side covers from LPM but someone here on the forum said they didn't have the tabs to hold in the screens - otherwise very nice. The swingarm is a probably a bit unique. The front wheel offset is probably slightly different than later models which were offset to accommodate 2 rotors. If you have the earlier version, this is good as it didn't develop the "head nodding" problem as did the later wheels. The gauges should have idiot lights in them and be dark blue (I think).
The engine... ahhh the engine. That is the fun part of this find. With HM300's, it was 67 HP. For comparison purposes, my K6 is 48-ish
I just nabbed a similar bike that is in pretty rough shape (cut up by someone wanting to make a go-cart) but mine has some (apparently) replaced parts. My gauges are not original nor are other front end parts (I think).
A lot of this is a guessing game. Honda did overlap model years in an unorthodox way.
Sounds like a great find!
I just looked at the serial num of my engine: 1038053 - THEY WERE VERY CLOSE BRETHREN
BTW- many of my factoids come from the famous "Hondaman"
