Budget racers quickest stock piston and head motors

1969 Dodge Dart Swinger Race Car Motor is painfully stock. Some tricks but mainly just spot on machine work.

340 bored .030 over
Stock replacement forged pistons measured at true 10 to 1
Stock x heads with small amount of port matching.
.509 lift purple cam degreed and installed straight up.
Stock stamped steel rockers
Stock intake manifold.
1 7/8 open headers
750 dp holley
29×13 slicks
4.30 to 1 rear gear
4000 stall converter.
Motor last rebuilt in 1982 or 84
Best ET for the car was 11.80s years ago.
My best ET back in 1995 was 12.0.
Ran the car after being in storage for 10 years a month ago with a few tuning issues 12.60 at 108...
I recently updated the manifold to a Performer RPM.
New Slicks
New fuel system. Can't wait to take it back out.