Leg room

[Lerch1145]

Question for the experts: for years I have had the dream of purchasing a 67-72 C10 and the time has finally come. I found an untouched 1970 C10 but found these trucks are not friendly for tall people. I am 6' 5", 240. Test driving my right calf was cramping while braking and gas. This would not be comfortable for long or short drives. Is this a lost cause for us tall guys without massive modifications? Thanks for the help.

I have also been told the 1973 and up have more room but the dream would not be the same