To avoid a bunch of speculation on your tune up. I would borrow a friends standard holley carb, if you can, that is proven reliable and give it a try. You may discover that your demon is the carb and not your tune up. The other option may be checking the float level and being sure that you are not running more than 7PSI of fuel pressure causing the flooding condition.
PS. I am glad that you got that trans/ torque converter spacing problem behind you?
Bruce