This is called a "static balance", they won't be balanced well. You do have options though.
1 - Glue on wheel weights. You can achieve good results by having them hammer on wheel weights to the inside lip, and using stick on weights just behind the wheel center.
2 - Powder balance. Anywhere from poor to excellent results can be had with balancing compounds (liquid or powder) or other media (like airsoft beads).
These are probably you two best options, but if the tires are not round, they will never drive well. I don't know what the quality of your re-tread tires is like.
06 FX4 - Superchip - Duff Bars - 33x10.50 BFG KMs on Alcoas - Cranked Bars and Shackles - C4x4 Winch Bumper