whats my Horsepower gain with these mods?

Here is my combo: Long rod 225 with KB239 pistons as described above. A custom ground Oregon solid camshaft .489 230 duration @ .050" ground on a 105 LSA. You've seen my ported head thread. It has 318 valves, 440 Magnum springs set up at 120 seat pressure. I am putting it in a 63 Dart 2 door sedan with an 833 overdrive 4 speed and 4.30 gears. The .69 overdrive ratio will allow for a final drive ratio of 2.967 in high gear but the 3.09 first gear ratio will give me a 13.287:1 first gear ratio. That will make for a hell of a launch. My only concern is too much compression. I am probably going to have to run a custom thick head gasket to retain the use of pump gas. We'll see.