Intake Manifold Dilemna

Hello Guys,
Just need an opinion. I've almost finish completing my 360 motor for my 1980
Volare Coupe. I have a couple of intake manifolds but trying to make a good decision on which to use. I have an Edelbrock Performer and a 1971 340 cast iron unit. There are several of my buddies telling me that the factory cast iron outflows many of the aftermarket intakes, but not sure if it would benefit my combo. My 360 is bored 0.060 over, with SpeedPro H116CP pistons on stock rods, Comp Cams XE262, "308" heads, TQ #6322 carb, 1" 5/8 Dynomax headers, 727 with 2800 stall converter and 3:91 gears. I haven't installed the intake yet, cause its on loan from a friend. I just don't want to dump money into an intake that may or may not benefit the motor. Any advise would be appreciated.
-AL