GOOD work! If it's decent now, I'd lean towards leaving it alone and focusing on the other many elements for improvement. Mainly because getting a flat tappet cam to not go flat recently is an issue. I wouldn't be afraid to advance it more to enhance lower-end power. You should feel even 2 degrees change. If the motor has good quench .04-.052" it'll tolerate some spark advance. If it doesn't...put a gasket on it now to make it 'good'. Then the carb has a whole range of tune to it that'll help. In a 440 with production heads that cam will probably loose power over 5500 FWIW.
