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Does the return at the tank need to be above fuel level? I've noticed that low pressure race setups are above and factory high pressure setups are below. Will a low pressure high flow race pump for non fuel injection work with a return in the middle of the tank?


With no scientific evidence , I am going to say yes.
Plumb it into the filler neck or top of the tank for the same reason as using a larger line. You don't want the back pressure that forcing returned fuel to the tank through 1/2 a tank of fuel would provide.
If you're using a cell , there will be a fitting located where ? Yes....on the top.
I put mine on the top front on the pass side because that is the side the return runs down. An oval track deal would want a little more thought than that.