knowing what you know now what would you have done different.

Personally: I would have taken the offer to go play pro basketball in Europe.
During the Gas Shortage I turned down: a 1969 Road Runner ($100), a 1969 Hemi Super Bee ($700), 1969 Dodge Polara Police Interceptor with the 440 Interceptor engine ($500), and then I traded my 1964 Polara 500 and the 426 Stage II Ramcharger engine that I was going to stab in it.