FiTech checklist

[VOoDoO70]

So I was granted permission( wife said ok) to go ahead and purchase the FiTech EFI system for my C10. I need a little bit of direction on which system would work best for my set up and what else I may need to complete the installation. I was leaning toward the 400hp kit but not 100% sure if I need to go with it or the 600hp kit. The truck is a 1970 C10 with a 355 sbc w/camel hump heads 202, voodoo cam, weiand intake, edelbrock 600 cfm carb. The fuel system is set up with an electric pump to the stock gas tank. I'm just needing input on those who are running similar setups what you guys are running and what else I may need. I may buy the kit with the new gas tank that relocates under the bed, but if I don't need to then I would like to go that route. Just let me know what you guys think? Thank you