I was going to mount the fuel pump (Holley 8011) in the same location you suggest, however, I noticed that it projects way too low. I found the best place is on the inside of the frame, on the drivers side and in the area where the frame starts to come up over the axle. Basically, just under the foward roll bar mounting brace. (The one you have to weld on
) A note on this in a minute.
With the fuel pump in the above mentioned location, it's not exactly below the level of the tank, but I can tell you that mine works just fine with no problems "pulling" fuel. Pick yourself up three 90 degree 1/2"pipe to 3/8" flare fittings. One on the tank outlet and the other two on the pump with one pointing upwards and the other downward. This arrangement works well when bending and routing the aluminum fuel line. Don't forget to use a nice size filter between the tank and fuel pump. I went to Discount Auto and looked at the various filters and chose one with a hose slip over nipple on each side. Like I mentioned one of 90 fittings come from the tank, I attached a short 6" piece of the aluminum tube and from that a short piece of neoprene fuel line from it to the filter. Then another piece of neoprene tube from the filter to a corresponding short piece of aluminum tube from the pump. The reason for this set-up is that neoprene bends well around the axle and it absorbs vibration which means less chance of a leak.
You can engineer this anyway you want
A note on the roll bar mounting bracket. Unless you have at least a 100 - 120 amp welder, the 1/4" steel is tough to weld. I blew the circuit breaker twice. This so happened to occur just when my wife was watching her favorite televison show. Yes, you guessed it, we were on the same circuit
One way you can get a good weld without using a higher amp machine is to heat the whole assembly up as hot as you can with a propane torch. Then proceed to weld. You have to get it hot. This is only alternative I know of.
Good luck