I've used the walbro GSL-392 on carb->efi conversions before. It's an external in-line pump and is very quiet, can not hear it when vehicle is running. The 392 is a 'high pressure' version of the 255 which according to this website would put out 60gph at 59psi.

http://www.autoperformanceengineering.com/html/fpspecs.html

You would need to run a return style regulator with it.