Adding Fuel Return line to 1970 Mopar

can i just punch a hole in the corner of the tank install a fitting and fabriate a return line? im just scare there will be venting issues since the return line will bring the fuel back with pressure 6-8 psi.

The fuel will be going out of the tank at the same rate (almost) that is going in via the return minus what the engine uses, so no pressure building (vacuum maybe, if the tank isn't at least cap vented)

Think about it like this.
There is less fuel coming back to the tank than went out, because the engine used some before it came back. :-)