Need help choosing a model...

Hello-

I am trying to find a unit that I can adapt to my 351C (for which there is no kit) carburated application. I was looking at a SN series Paxton, but I am slowly coming to the realization that a) I dont have enough room, and b) they arent the picture of reliability.

I am looking at Vortech now, and to be perfectly honest, I dont know what I am doing. I need to choose a model. It needs to be standard rotation, with a passneger facing outlet (or curved... actually curved works better). I wish there was a self contained unit, but such is life.

What unit is going to give me between 5-7 PSI without having to run the thing ragged? What kind of CFM should I be looking for?