Horsepower

A 318 magnum was rated at 230 HP. Putting a carb on it will not appreciably change the horsepower of the engine. Kind of hind site now but the best thing you could have down when you rebuilt the engine is to have used higher compression pistons and more cam. Anything you hang on the outside of the engine will only have small improvements.

The magnum engine used a different pilot bearing set up than the engines that came with A833's. The hole in the end of the crank shaft will not be drilled deep enough or large enough to accept the A833 input shaft and pilot bearing. The fix is to use the magnum roller pilot bearing and cut some off the end of the input shaft on the A833.