I ran a radiator cap housing off the the old water neck location.(cadillac 500) i used a a 32psi radiator cap because I get paranoid about cracking cylinder heads without a water pump. I later found corrosion issues because I didn't drain the water between races (using water wetter) so I went to a 15psi "rad cap" and drained the water between races if it was going to sit for a while. but to answer your question, yes. I ran a puke bottle. the thermostat housings come drilled 1/8npt so I ran a small pushlok 3/16"? pneumatic line all the way to the back of the car by the parachute where it mounted with a breather so if i overflowed it the water would be behind me. but since it was mounted above the motor it would suck the water back in as it cooled. rarely had to add water unless I got it really warm.
