help with 73 340

'73 340 Darts had the 8.25" rearend.
All 340 automatic cars had the 727.
Pistons in the 340s were supposed to be 0.018" out of the hole. After my block was decked and squared the KB243 pistons are now 0.020" above deck.
I swapped the original 1.88"/1.60" J heads for 2.02"/1.60" O heads.
But, with the factory open chamber heads and 0.039" thick head gaskets, I still don't have quench. I guesstimate the CR at 9.8:1. That was the only thing I didn't measure when I was assembling the engine.#-o
The heads have stainless valves with a 3-angle valve job. They were pocket ported and gasket matched to the intake.
I'm running the Lunati Voodoo 60403 cam, Edelbrock Performer RPM manifold and Holley 750 cfm vacuum secondary carb, along with TTI headers.
If Desktop Dyno can be believed, the engine is around 410 horsepower and 390 ft lbs.
It is a fun car to drive on the street. Gas mileage stinks but, who cares? It's not a daily driver.