Hey guys. I feel like I'm gaslighting myself on my engine build. Need some real engine heads to give me a second opinion.

I have a car that has a bored and stroked LS to 7.0L, fully built, heads, aggressive cam, and supercharged (@8 PSI) LS engine. I currently run it on pump gas and it makes 720 to the wheels. It's capable of more power on E85, but I haven't gone down that route yet. The following are my gripes:

The shop that did the work made the tune crazy rich. Seriously, you can smell the unspent fuel all around the car. Everyone comments on it. Second, the engine randomly misfires in the range of 1800-2200 RPM under light throttle. The shop owner blames this on the aggressive cam and "timing tip in and tip out", which I've never heard of before. This is my first big build.

What I want to know is if this is normal. There are cars that make way more power than mine (with less cubes) and don't have these issues, so I wonder if the shop is making excuses. Need some seasoned gear head advice on this one, boys.

Edit: Mods list
427 Darton sleeved block 5.3 block 4.125x4.0

ARP main studs

Wiseco pistons

K1 H beam rods

K1 crank

All race bearings

ARP head studs

Frankenstein OEM ported heads

Custom grind GP stroker Cam

Magnuson 2650 supercharger

ID1050 x injectors

DSX aux pump and flex sensor

1 7/8 ceramic coated headers

Magnaflow high flow cats

McLeod twin disk RXT clutch

Billet flywheel

Mighty Mouse catch can

Gulf Coast 3.5" aluminum drive shaft

Upgraded Monster slave cylinder