Just finished rebuilding my 1962 FC 150. Rebuilt every single part to factoy specifactions. Added power steering and power brakes. Took it for a test drive and everything worked. The only problem is it wondered on the road. On smooth pavement not too bad; on grooved roads tended to follow grooves. We think it is the 600x16 military tires. I am thinking that 15 inch wider tires may solve the problem. Any thoughts on this.