i routed mine down the center tunnel. i used electrical conduit like kennedy suggested. and borrowed a conduit pipe bender to make slight bends in the tubes. they come out the stock cover plate in front on top of eachother, and they run along the passenger side of the tunnel on top of eachother, then they curve to the passenger side, and exit side by side, out the little area where the heater cables went and the ebrake cable holder is. on the other side is the throttle cable, other ebrake cable, clutch cable etc.
since you are doing an engine conversion, im assuming you dont need heaterboxes anymore
so you can take out the heater cable tubes in the tunnel. not as easy as it sounds lol, but after an hour or so it should be done.
after thats out, the tunnel is pretty bare.... you have the accelerator cable, clutch cable, and fuel line and they are all on the drivers side of the tunnel. other than that, the ebrake cable tubes are there, but they run along the roof of the tunnel.
the shifting linkage is in there, but i ran them on top of each other on the side of the tunnel, and they dont interfere with the shift linkage at all. ill try and get pics.
btw i have a type 3