While you are at it add some stainless steel tubes and set it up for reburn with a nice baffle, sounds like you got the welding knowledge to do it. Those big moe's are pretty much bulletproof, would take a lot to damage it, but they can be warped beyond repair. Make sure and weld that rear exhaust plenty good, check the weld around it with a flashlight as it might need some touch up after all these years of burning.
Here is a good thread on setting it up for secondary reburn: https://www.hearth.com/talk/threads/bullard-secondary-air-retrofit-project-complete.55033/
Here is a good thread on setting it up for secondary reburn: https://www.hearth.com/talk/threads/bullard-secondary-air-retrofit-project-complete.55033/