Cam shaft suggestions
i'd sort out why you don't have any bottom end and timing issues before jumping to the conclusion that the camshaft is the answer to those issues.
318WR brought up a very salient point, or the "death by 1000 cuts" as i like to call it. compression is a little low, timing is a little off, carb tune is wonky and you get a turd that doesn't have enough power to pull a sick ***** off a piss pot.
get your basics in order: compression test, cylinder balance test, leak down, distributor timing and curve, carb dialed in, all vacuum leaks eliminated. make it run a good as possible before tearing into it. throwing a cam and timing chain at a motor with a soft cylinder isn't gonna make it any better.
as far as a cam goes, i'd contact oregon and talk with them and have the cam reground to their suggestion for the application.