1959 D14 - Need some opinions

I have a 1959 D14 that has been in the family since new. My great-grandpa owned an AC dealership and he bought the D14, and a WD45 Diesel at the same time.   This D14 has worked nearly it's entire life here on the farm. No clue as to the hours, but it's well over 5,000 when the meter stopped working.  

My current issue is that she is burning some oil, and also runs rough after 1 hour in the field.  The #1 spark plug seems to continually foul or not ignite as hot as the other cylinders, which causes a miss under load.  I have done frequent oil changes, and also played with a few different fuel/oil additives which helped the oil burn issue.  It's hard to see if there is blue smoke upon startup, but when the tractor is way out in the field I can see blue smoke rising out of the stack.  

My current thought is to do a compression test before I start throwing ignition/fuel parts at it.  Assuming the compression is within spec, I think i will need a new condenser, points and maybe a coil. I also thought a carb rebuild would not hurt either if it's starving for fuel when hot.  

Any other recommendations would be great before I start tearing into it!

Thanks! I am running some Autolite 295's now, I believe I changed them last year.  It seemed to help initially, but over time the engine started missing again under load.