Reaming a mig filled hole.

[jeepguy800]

I have a jeep project I'm working on and I'm trying to sort the steering problems out. I want to mount the tie rod on top the spindles instead of the bottom for added clearance. It is a tapered hole and I need it to taper the other direction. I'm thinking of placing a piece of copper pipe in the hole and filling the taper in around the pipe then using a reamer to taper it the other direction. I have it all figured out but I'm concerned about trying to ream out the weld as I'm worried it will be too hard. Anyone have any experience with machining weld? Any other suggestions? Open to any thoughts, suggestions, and advice! Thanks!