Reading your post reminds me of how I need to get back on my engine build. Ive recently been a slacker.
As soon as I get up to see Mr. Hall I am going to ask him about the dip at the lower outer edges of the exhaust port and see what he says, although at that point it will be too late to massage it for me.
I'm almost too terrified to take the trans apart to be able to really work with the cases. I guess I should get over that fear since I do have the manual but still.... makes me nervous.
Ive opened up the intake boost ports, really I just smoothed out that area where it looks funky and obstructive to flow. I will also smooth the jug casting to sleeve in the transfer ports area at the bottom of the jug where the charge enters but, I dont think I will actually mess with the transfer port windows, not this time around.
Hell, I still have all the suspension to dial in, a carb to jet, powervalve to check, and im running out of time.