nhra WILL pass rubber hose if its in the stock location and came with rubber, but you can't plumb the whole car that way......
braided hose is pretty thats why everyone uses it....
convert your 1/2" AN (wich stands for army navy and is used mainly in aircraft) to 3/8 " flare and run it in steel you can use a VERY SHORT piece of rubber hose from the steel line to the motor to allow the engine to move some