fuelsystem for blown 340 ?

I would at least install a girdle, that will strengthen the lower end quite a bit.

I would do some research on the blower you are using and ask around to see what issues others have had with the same setup and what fuel delivery and boost they are running. One thing I've learned while setting mine up is you can ask 20 different people running the same thing and come up with 20 different ways to set it up and 50 different problems, I did this and just used the comments and help that made the most sense as well as reading several different books on superscharging. There's several good informative ones out there, BDS has a supercharging handbook. There's also one by Pat Ganahl called Street Supercharging and I have an older one from the 70's called Super Power, a do it yourself guide to: turbocharging, supercharger, fuel injection and Nitrous-oxide. You can also probably find something on ebay.