I have asked ths same question before. My 1953/54 Chevy pickup truck sits on a z'ed frame but other than that the inside is all stock. I have been working inside on the floor pans and pedals and such for at least 2 monthes now and I have to tell you these old vehicles are tight tight tight...I am 5'7" tall and with a stock height cab and a pair of old aluminum stock car seats my agility is going to be challenged once I get it done.
I dont know how you guys chop tops and channel stuff and still feel comfortable driving these things. Some of these cars are stupid low...do you think they really drive them???
I know this is supposed to be a throw back to simpler times but how did the kids back in the 1950's and 1960's drive these old rust buckets???(and all us current day rat rod jockeys)
MikeC