Nice real car too!
For the pipe, if you have a tube bender it would be quite easy to fab a curved section that goes above the engine, leading to an expansion chamber...which can be "salvaged" from another pipe. If you're going to use steel, a basic arc-welder that will do the job isn't too expensive, and it's even cheaper if you have a friend close by with one
I just realized something about your carb though - it seems like it's a slide carb with a float bowl from the pics. Unless you mount the gas tank above the level of the float, it won't work properly. I had the exact same problem, so from a center of gravity and performance point of view, I went for an aftermarket tunable butterfly carb. It really does wake the engine up as well, so no regrets about that.
Enjoy the snow...
