WOW, thank for taking the time to type up all the great information! I'm using the Moates chip and adapter. I don't have any cat converters and EGR is deleted. I'll try the trimalyzer, maybe it...

Did you have any luck with your tuning? I also have a '90 Corvette and plan on replacing the 350 with a 383 later this summer. How is it working for you? I'm also new to the whole PROM programming.