Why reinvent the wheel with a Holley?/
I have to ask the same question. I have not had any reports of failures of a genuine Walbro GSS342 pump (there are some cheaper fake ones about) and it seems to work perfectly well. It is over specified for the M3W installation but has low power consumption, unlike many "performance" pumps. The pump is not working any harder or less in a M3W than a big power V8, it just maintains a regulated pressure at the injectors and returns the excess back to the tank.
