Electric to Mechanical Fuel Pump??

[ratty 46]

OK ....

I'm removing my tbi from my '87 Crew Cab (454 engine) .... & will be replacing the complete unit with a:

Carb, Intake, new HEI & MSD box

My question is ........ I'd rather go mechanical fuel pump & not have to run a in line regulator. I want to know if I really have to remove the in tank pump to run the mechanical unit.

Will the mechanical pump draw the fuel through the in tank pump? Or will I need to remove the in tank unit. Why?

I'd prefer an answer that is not subjective but actual.

Any related info is appreciated.

Ratty 46