Freeze Plug Replacement Motor in Car

I drove my 71 Honda AN600 300 miles to Vegas on a whim with a buddy. Should have seen people passing me, the must have thought I was nuts...yeah! On the way back we blew a tire and I didnt have the right lug wrench as I had 10" mags in it. Pulled out the spare and it was flat.. Doh! I finally got some air in it and it was the original '71 Bias ply with more cracks in the sidewall than Betty Whites face. it was a long trip home.