I don't know much about the warlbro pumps so I can't say much about them but, make sure you talk to BDS or Dyers and see if they would recommend them on a blower setup.
You need high volume, not high pressure! high pressure is good with injection but not with carburetors and definitely not for a blower setup. The higher pressure doesn't get the fuel to flow in the carb any better or faster and when that blower is sucking more air, you better have the volume of fuel needed to supply it or you may end up exploding the engine from lack of fuel. High pressure in this application isn't going to do anything other than cause needle and seat issues and leaking. I'm only running 4.5 - 5 pounds of fuel pressure but my pump is capable of a lot of volume and I have the fuel line to back it up.
Because of the blower. If anything, 1050 cfm may not be enough. I'm running dual 750 DP Demon blower carbs with a 671 and when I bought them I was going to be running a 340 and not the 416 I ended up building my carbs are a bit small now for the cubic inches but I don't have the boost I originally was going to run so it works out ok.
When you have a blower you can be flowing upwards of 10 times as much air of a naturally aspirated engine depending on your drive and boost and you need a carburation set up and fuel delivery system that is capable of keeping up or you could starve the engine of fuel or choke it at higher rpm's.
One thing though duster340, I'm not sure what the volume of your blower is but I wouldn't try and run the full boost capabilities of the blower unless you have a bullet proof lower end and running high octane fuel. 15 pounds of boost with 8-1 compression can give you upwards of a 16-1 final compression ratio depending on the volume of the blower, 12.4-1 final compression is max for 93 pump gas and is a lot for street use.
I have 8.5-1 compression in the engine with 6.5 pounds of boost and that is right at 12.5-1 final compression. If memory serves me correctly, 8 pounds of boost would give you around 12.4 final compression with 8-1 compression in the engine.
