well skooterbum the math that i come up with is if you use all eight elements on 1 source line it will draw 94.5 amps. if you can split it that will bring it down to 47.25 amps per side. that is a large draw. the following thread will help you size the elements to the oven.
BTU Calculator
i put in 400 degree rise in temp and good insulation and came up with 8438 watts needed. that would mean you would need 4 of your elements. that equates to 47.27 amps draw on 1 source line. hope this helps bro. if you need more info just ask.