Could someone help a brother out?

Is there anyone in this forum who could service my bike for me? I just feel like I’m not getting anywhere with it and it’s just making me frustrated and mad. I’d be willing to pay. I’m in the southern Missouri area. I just don’t know what to do with it. I really like the bike but I simply don’t have the knowledge or equipment to do it myself.
Here are the immediate things I notice.

1: Cyl 3 doesn’t seem to be firing. I know for sure it’s got good spark, around 130 for compression, and the carbs seem to work as they should other than needing tuned. I have a feeling it may be a valve issue. I recently did a valve job and replaced all the shims, but I feel it may be further than im willing to go myself. And it just runs extremely poorly. Although I’m no expert

2: 2nd gear doesn’t catch properly. It makes an awful rattling sound and often makes the shifter get stuck. I pulled the left side cover off to inspect, but found nothing immediately wrong. I’m uncomfortable splitting the case myself, nor do I have the tools to do so.

3: The starter clutch seems to be going out as well. I get a crunchy grinding sound sometimes when I hit the starter. I figured maybe as well replace that if you have to slip the case to fix the transmission anyway.

Like I said, these are the things I notice. All I want is for it to run properly so it can go another 40 years without having to be messed with.

If there’s anyone here than can help me out that won’t charge me an arm and a leg, please let me know. There nothing else I can do at this point to make it any better without having any service manuals or anything.