Callum,
You may want to check out this site and in particular the link about fuel pumps. Basically, they indicate that for Webers you need high volume but relatively low psi (about 4). I took their advise and fitted the Carter 4070 with my triple 45's and no regulator and everything has worked well with no problems after 3 years. I am using the standard Z fuel rail. You will also find some other tuning info regarding spark, etc. I don't have the vacuum connected and run a standard 280 electronic distributor.
http://www.racetep.com/webfuelspark.html#webfuel