360 magnum into abody and efi/carby questions

Thanks guys
The main reason I was going to go the factory efi was price. I spend all my money on my supercharged car and i am still chasing HP in that engine so with this car I just want to spend minimum on this engine. I was only thinking around the 360 FWHP because this was easily achieved with the stock magnum block,heads etc but just with a cam etc. I think the cheapest way would be to achieve efi is to use the factory set up but I didn't know if they could support 360FWHP. If it will support the HP i am trying to get my head around what i will need to do to it to make it run in my car.
My other option was a efi carby like this. Looks pretty simple too.
http://fitechefi.com/default.asp.pg-Products
I have read so much over the past few days that I am forgetting stuff. I will go back and read the PM messages you sent me John as I think you gave me some details on running the efi