Should I be feeling more power?

Rude72* said
Do you think it simply needs a tune up?

What is meant normally be a "tune up" - spark plugs, cap and rotor, set points, etc. and set timing and idle fuel mix. It wouldn't hurt to change the oil and just check everything (spark plugs, air filter, cap, etc ) at 2000 miles. Looking at the condition of these items will provide some clues as to how the engine is doing.
More likely it needs to be tuned in. Its not factory so adjustments need to be made one at a time.

Rude72* said
Mechanical Holley Fuel Pump on engine as well as secondary Holley Electric
Fuel pump located near fuel tank and operated by switch in cabin

Rude72* said
I’m wondering if it’s a fuel pump issue…

Not directly. Even if the pump fails entirely, thereisenough fuel in the bowl that the car will run 10-15 seconds at wide open throttle before going dry.
I do wonder why it has two fuel pumps. It was something at one time in the old Direct Connection bulletins but if the mechanical pump is working correctly a stock pump is all that is needed for this engine.

Rude72* said
Everything motor-related, including transmission, has recently been rebuilt. Supposedly, all drivetrain components from front to back as well as suspension and electrical additions were rebuilt and/or installed by the Montgomery Race Team. Currently the engine and transmission have roughly 10,000 trouble free mites since their rebuilds. Drivetrain(Engine, trans, rear and suspension) was rebuilt and installed by noted Mopar Super Stock factory backed Mopar racer Ken Montgomery Sr. (verification available from the family if requested). Has been maintained by the same family as well.

Sure. call them.See if the family knows anything about it. Nothing to lose and maybe a little insight into what they did. Ken Montgomery's place was a bit North of Philadelphia. Montgomery Service Center. Was a super nice guy - passed away a few years ago.