Can you fit on the Streaker? The T-Bird is a little bigger and has a front suspension and a seat with springs to absorb bumps. I had 2 T-Birds before. I liked them.
In post 1 you asked for input. IMO the T-Bird would be the one I'd buy. The parts are available and if you don't care about it being 100% original you have a lot of options. I would leave the scrub brake on but put a clutch band brake on it. The clutch brake works WAYyyyyy better as long as the chain is still on. If the chain breaks or come off, you have the scrub brake as a back up. The clutch brake also comes with a small clutch/chain guard. You can fab up something longer to cover the chain if wanted. The throttle asy is cheap and comes with a grip for the other side.
The kill switch is easy but my advice is to mount it on the handle bar next to the twist grip where it is easy to get to in an emergency - like if the throttle sticks wide open. A switch on the frame or on the engine requires you to let go of the handlebars while you hunt for it. That short time could mean you get away unhurt as opposed to crashing. My opinion, others will vary.
The T-Bird front seat pivot may need some work to tighten it up or the seat will sway left to right as you ride it.
The T-Bird has bigger diameter wheels and tires, they help in grass or rough ground as opposed to the small Streaker tires.
Let us know what you get. We can help with advice and problem solving.
Danford1
