Welcome to CHR! You have come to the right place. If you got a problem we can dispense enough opinions and wisdoms to make your head swim.

At 6'1" (inseam 32") I am by no means as tall as you are. I probably have you by 100 lbs though. But to answer your question about fitting into a streetrod....the answer is yes. Depending on the kind of car you may have to make some modifications like stretching the body, moving the firewall, not doing a deep roof chop, etc.

At my height I have about 3 inches to spare over my head in my 34 Plymouth sedan. Now I know that don't sound like much, but the roof has been chopped 4 inches and the original floor replaced with a flat stainless steel floor that rises from the firewall to rear and the seats are both on risers. So if mine had less of a chop and no seat risers you probably could fit comfortably inside.

Later cars 36 - 48 had more room every place, front to back, side to side and overhead, so one of those years could work out really well for you. Both in a hardtop or a converible. One key is careful planning, from picking a vehicle to modifying it. Go get yourself one and enjoy the fun.