No problem...... 426 vs 383. Same bore and the 383 has the higher rod ratio.

Or better yet..... 383 vs a 383 stroked to 442(4.25 bore x 3.90 stroke).

383 rod ratio = 1.88
442 rod ratio = 1.71

Same scenario...... 10:1, rpm heads, rpm intake, 1-7/8 headers, 509 cam, 850 carb........ which wins that battle?

Not only will the bigger motor make more power...... I’m thinking the difference in power will be at least what the difference in the cubes is.