If it's like the one I have, it is also welded on the back side. I didn't grind mine down to far because it's not welded on the front side. I spaced the intake ports with some thick gaskets to level it with the exhaust ports.
I don't know why they raised the rear so high. This is the way that i bought it. I don't see how i could lower the rear and still have the rear fenders line up with the running boards.
Is it normal to have such a big difference between the front of the body and the rear? I ask this because on the front there is no gap and on the rear part ( in front of rear fender) it looks like about a inch gap. Could this be why my hood has a large gap at the bottom?
I run a Stromberg 48, seems to work good. Only drawback with my setup is carb sits to high and runs out of gas before tank is empty with gravity feed only.