Is my engine performing as it should??

That weight and MPH shows about 225hp at the wheels.

If the hook was right and you could maintain the MPH, it should run 13.40-13.60's. It would take some gear and a converter.

My Dart 4 speed is a basic 70 340, cam 214/224 445/465, LD340, 750 Vac, headers, MSD, 3.91's and 245/60/14 tires. Best runs 13.30's at 102.00. I'm guessing it makes about 320-330 at best. No way your engine is making 380. More like high 200's-low 300's at best

My friends Demon is a 360 w/340-350hp, car weighs in at 3375 with him in it according to the Vegas scales. It ran 103 at vegas running a 14.10-14.20, pegleg 2.76 gear rear. We figure, car hooking with some gear, it should run about 12.70-12.80's

I think your car is running pretty decent for what it currently is.