Dude!
You are pretty resilient. How may times can a person rebuild a new car? I like you attitude.
The way most balance a motor is put the lightest piston with the heaviest rod and take material off the balance pad of the rod and add or subtract weight at the crank.
Have a friend that has one of GM's ZL-1 blocks punched out to 496. His motor made 603 at the flywheel. Not sure the specs, but I can get them for you if you like as it would be a good starting point to try and squeeze out another 50 hp.
Are you happy with your rear suspension choice?
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