Doing my fuel system, 408, street car that will see track 3 times a year, 490hp, 950cfm carb, head work done at modern cylinder head. Engine has been on engine dyno only so far and broken in, so I have not driven it on street yet.

Here's what I have, new pick up in tank 1/2" IIRC, no return line in sending unit, 110g electric pump (holley blue design). I'm not married to the idea of this pump as I've not used it. But I'm reading and receiving mixed advice.

Is a return line a must for a street car?
Are there more cons with electric v mechanical?
Do I need return line with mechanical if I go that route?