My engine is so much different, I don't know if this helps. But since you asked.
When I dyno tested my new engine, it made within 1hp in back to back fuel tests.

The dyno shop starts all new engines with their carb and 112 octane race fuel.
After verifying A/F and trying various ignition timing settings, we put my 1150 carb on the engine (still with 112)
Then after verifying A/F was OK, we switched fuel to 93 octane pump (up to 10% ethanol).
We did manage to get 4 more horsepower with minor jet changes and putting an additional 0.5" open spacer under the 1" tapered 4-hole spacer. Most was from the spacer, not the jetting.

496 CID wedge (4.15" stroke, 4.36 bore)
factory iron heads
10.3 CR flat top pistons
268/274 at 0.050" mechanical roller cam (kinda big for CR)
race car's headers stepped 2" to 2-1/8"