www.gunsnet.net/Linx310/gascantfix.htmI misread what you wrote. I was talking about the FSB. I haven't needed to remove a gas block. Does it function/fire alright? If so, I wouldn't bother, but if you just have to uncant the gasblock.
If you have the pins out, saturate the area of the gas block with Kroil overnight. I say Kroil because I have heard many people say it is the best to get into tight areas and loosen them up. You might be able to use liquid wrench to disolve anything in there and then use another lubricant. Put the barrel assembly in an upright or chest freezer for several hours. Then put the barrel in a padded vise and heat the gas block with a propane torch. If it doesn't move at that point I would get an AK smith to do it. Don't want to screw up the gas block. Do you have a press?
How bad is it canted. I've never seen one that was canted. I was able to hand pick mine from pallets of them though. I did have one with a slight cant to the FSB. I sold that one.
I think a rawhide mallet would be less likely to damage the gas block or a weighted plastic mallet. A hammer should work but I would be likely to hit it to hard.