You're certainly not the first person to try splitting cases without removing all the bolts! You'll never do it again, that's for sure!
That piston has run really hot, thought it'd look like that based on the build up on the crown. I wouldn't go any more advanced with ignition just yet. Definitely go up one on the main.
The comp is on the high side and most likely causing a bit too much heat. I know you love the way it runs but if you want to go down half a point on UCCR then just send the head back and ill take some volume out... Then you'll be able to jet down and may unlock some extra power, at least up top anyway.
With the transmission just look for scoring, discolouration, wear marks, etc on the teeth, shift forks and dogs. Some minor wear is normal, a lot of wear or discolouration is not.
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