NEED HELP! or im selling it

For your first issue, start by looking for any foreign material blocking the needle from seating, or the float sticking and letting fuel to continue to run out of the bowl. To me, it sounds as though it's getting too much fuel and fouling out on startup. Either that, or a choke issue (I'm honestly not familiar with the Speed Demon carbs, so I really can't help much there).

You need the ignition advance, which may also play a role in why it is stumbling. The higher the RPM goes, the more advance you need, so you can get the mixture ignited soon enough during the compression stroke. The EFI guys fairly regularly will comment that they notice the timing jump significantly after putting the spout back in when setting the base timing. If you're going to run locked out timing, it would probably run better with the timing set somewhere around 20° BTDC.