That article tells you why.......away from engine heat, IE away from exhaust and not on top of the hot engine. The PROBLEM is that modern alcoholized gas boils easier, and is more subject to vapor lock problems. Go to MyMopar and download a couple of service manuals, if you have not already.
Look up the 69/ 70 440/ 440-6 or hemi in the fuel section re: the third line return can. You can duplicate that with a couple of different Wix filters, but of course you'll have to build a return line
Best thing I did on my 67, before I converted to EFI, was to convert to a rear mount electric pump (pushes not suction, so increases fuel pressure because it doesn't "suck"), I built a return system, and used a big insulated spacer under the carb. There is some evidence that Carter/ Edelbrock carbs may be worse because the float boats sit down flat on the intake.
Wix 33040 (5/16) or 33041 (3/8) both have a built in 1/4" return port (orifice). This port must be "up" and return to the tank
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