On mine when I swapped from SU to Facet I checked the specs of the carb to make sure I knew what it wanted in terms of pressure and flow. The silver top pump seemed most appropriate for my small block but a red top is probably what you need.
I bought the kit which includes new bobbins etc and a selection of springs from Facet so you can alter the pressure of the pump by unscrewing the bottom of the pump and swapping the spring over.
I had two goes at mounting it until I found a spot where it couldn't vibrate against anything.
On mine it's very quiet (inaudible when running) and I'm happy with it.
I didn't use a regulator and all seems fine.
On previous cars (not Bristols ) I've used them and mounted them in all sorts of places - so I wouldn't worry too much about whether it's below the bottom of the tank or not - they seem to cope.
Hope this is of some use!
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