Well, first of all the barrel length is very unusual, unless you are measuring wrong. As Ray stated, (Lobo) they were not produced in that length standardly. That's the first issue, accurate measurement. Refer to his post for the correct factory production barrel lengths. However, if it's a post factory cutdown, a custom holster is in order, providing that's what you want. I think you will find any K frame over 3 inches uncomfortable for prolonged periods, worn inside the waistband.
As a policeman in NYC working plainclothes during the 70's, I routinely carried a 2 inch snub gun and my service revolver, a 4 inch Model 10. I couldn't afford a second snub gun at the time and I was not undercover, so concealment was not a major issue. I think rather quickly you will discover despite your described physical proportions (I was quite larger than you back then) that eventually, you will find it agonizing for long hours.
Having said this, if this is what you have and what you can afford for now, a good quality hi ride pancake makes sense, in conjunction with a sturdy gun belt and cover garment. An IWB will be torture after a few hours in and out of the car. Similarly, a shoulder rig would be more comfortable, but requires a cover garment, year round, despite climate.
If I were to carry an M10 for work or play today, I'd use a HALF BREED SLIDE. Fast, compact, concealable. Here's a stock photo with a Chiefs Special.
Hope you find this helpful.
Lefty