I am 6'5" and 300 lbs. I try not to shop too much off if any. You can get a lot of room by playing with the seat mounts. I usually put them almost on the ground. The harder thing for me on the 30's and older cars is foot room for my 15EEEE's!
Have you thought about a Craigslist search for an abandoned project T? A lot of folks buy them and never finish and just want to unload them. I would think it would be FAR easier to lengthen and widen and existing boy like a speedway or something....
Sorry for your loss, but your post will get me going again. I let the FRUSTRATION of a few relatively minor setbacks completely derail my 64 Impala Convertible project. As soon as I get off work, I am going out to the garage, fire up the heaters and make a 4 week punch out list, I am going to...
Jaloopyrama in Maryland is getting to be a HUGE show, there are some great rides there
http://www.jalopyrama.com/2013/03/jalopyrama-10-saturday-october-19-2013.html