Feel like my 440 should be faster

Standup303, I feel your pain. I live near Parker, CO at 5800' and miss the power of my 340 when I lived near sea level in SoCal. I am running 10.05:1 actual compression, essentially stock 340 specs, but you lose 20-25% of your HP due to altitude. There were times at Bandimere when the indicated altitude was 8800' due to temperature and barometric pressure that day. Knocks well over 1 second of 1/4 mile times.
Understand that Bandimere will reopen in Hudson, CO.
"The family-run speedway, now led by Bandimere Jr.’s son, John “Sporty” Bandimere, hopes to have the new facility partially open by 2025, with full operations by 2026. While a partial opening may not be profitable, Bandimere Jr. emphasizes that maintaining the racing family’s legacy is the top priority: “It’s about keeping this racing family together.” Bandimeres Explore Relocation to Hudson, Colorado for New Expanded Facility | Drag Illustrated

BTW, what dyno facility were you planning on using? Not many left in CO.