I would say one of the things that might give is your back, if you have stock suspension. I drove from the San Fernando Valley to north of the Bay area (about 300 miles) in a '53 and my back was sore for 2 days, and I was YOUNG, not like how I am now.

'70 chev 3/4 lwb
'67 chev 1/2 swb (project
someday another '55 1st series!