RE: Patriot40 build, a few problems...
can't speak for the Rossi, but the Jett combined with Bubble Jett tanks works very well.................you aren't pulling from the rear tank like you think as the pressure from the Jett is pushing on the bladders, plus you won't have any foaming issues. the idea of using a 6 oz BJ tank in front is that it is smaller diameter, and fits almost all the way up to the FW and doesn't push the 8oz B J tank back much more than 1.5-2 inches back from where it would be anyways thus not creating any problems as even at 6 inches back the fuel draw is fine.
you have to think outside the box on this one...........otherwise, give a Perry pump a try.
pumps are great when everything is just right.......off a bit, and it's blast trying to figure things out.............no not really.
if you use a V30 pump though, where will you mount it?.........there is hardly enough room as it is.