If you have any concerns about the Via Aqua one suggestion is to submerge it inside a container/reservoir. This requires a couple simple bulkhead fittings to make it happen but there are no worries about leaks from the Via after this. You will want one hold in the top for the coolant to enter the rad, one sealed hole around the power cord, and one hole (probably in the side) for the pump outlet.
It takes a little space but is pretty easy to do for about $6.00 in fittings from McMasters. For a bulkhead fitting you simply get a threaded one end/barbed other end fitting and drill a hole to fit the threaded end into the container and use a washer or RTV sealant around it and use a lock washer to tighten it into place. Then on the inside of the container use a female threaded one end/barbed other end to connect the bulkhead fitting to the tubing leading to your pump. Of course use plumbers tape around the connections and some sort of sealant but it works fine. This has several benefits from what I have read as well as a down side. The upside is that it muffles vibration quite a bit, cuts out any worries about the pump leaking, keeps the pump cooler and quiets the pump. The downside is that it does add some heat to the coolant loop. If you use this I would suggest using the double '77 Bonneville heater core to shed the extra heat from the coolant. For a shroud for the '77 HC you can use 2 of the containers you used on the Chevette. It just takes a little modification and they fit well enough to work.
Look for some sort of Tupperware or a cheap variant for the reservoir to seat the pump in but make sure the lid seals well to avoid evaporation of the water in the coolant. I would also look for one with a fairly rigid top. Lastly I would also use something like zip ties or some other sort of fastener to keep that lid down tight on the reservoir.
The same sort of cheap bulkhead fittings can be used with or without a res to create a T line fill-n-bleed kit. This time however after drilling the top of the case (normally) and putting the threaded end of the fitting up through it then securing via a lock nut use a female threaded cap to seal the loop. To add fluid simply screw it off and top off the fluids and put it right back on. Its a very inexpensive version of the DangerDen Fillport.
McMaster.com also offers another tubing that works great- Masterkleer which is $0.57 per foot in 10' increments. Thats for the 3/4"OD-1/2"ID tubing
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