You won't get far insulting the guru of gurus. Crosley is an expert.
You have chosen a junkyard tranny. That should be your first clue. Secondly, 90% of the 200-4r trannys out there are designed and calibrated to operate in vehicles that redline at 4200 with rear ratios in the 2.73:1 range. Simply droping one of these into a performance vehicle is equivalent to taking an F1 race engine and putting it in a pickup truck, then expecting it to be competent at towing 10,000 lbs.
200-4rs are known for their early shifts. They were installed behind Olds 307 engines that struggled to make 140 hp and redlined at 4200. Simply installing one behind a performance engine and expecting it to work in its stock configuration is pretty riduculous.
What you're experiencing are not "symptoms" they are merely the transmission operating properly. You've just made a piss-poor decision, so don't take it out on us.