It normally would be good enough, BUT, if what you are saying is true, if any of us had a failure at a front wheel cylinder our brakes would be totally gone. While we are driving or not. I say 'failure at a front wheel cylinder' because that is what you described by having the problem arise while bleeding at the front wheel cylinder. Can you see why it's so important to be sure of the problem? Spring a leak in one corner and die. Is the block you bought used? Is it going to do the same thing your last one did but when you are driving? Is your car safe to drive if you have not pinned down the problem? It's not like a carb adjustment or timing or charging system..... What if the problem comes back????