Guys,
I've put together a new motor and am having issues with a off idle stumble/miss.

It will idle fine, but when you matt the gas in neutral it will hesitate and then "catch up". Same goes with throttle application in gear.

I go for a dyno tune on Friday, but want to know if I should hold off until I can correct this, or if it's something they can "tune out". Here is what is new:

new bottom end (331, 10.5:1 Forged Pistons, Zero Balance)
injectors (24lb to 30lb)
MAF (75mm-24lb calibration to 80mm-30lb calibration)
T-body (65mm to 75mm)
Bigger air filter for the new MAF
New plugs, cap, rotor
New fuel filter

Timing is at 14-degrees BTDC
Fuel pressure is "in range" at approx 40psi with vacuum line pulled. Anything over 35psi is "good enough". I've run as high as 50psi on smaller injectors.

The previous combo had a "no name" chip in the computer that I pulled since I'm having a chip burned to drop the power levels.

Once the car is over 3K, it runs like a scalded ape. I'm just concerned with throttle response, in general.

All the cylinders are firing, but #4 (passenger rear) and #5 (driver's front) are "colder" than the others. I don't know if this is a Ford thing, or part of the problem...

Ideas?