Do the carbs one at a time as parts are different, but will fit wrong carb. Don't forget to install choke crossover tube between carbs.
Either get a Clymers repair manual or find the download on the forum.
The boost bottle does nothing for performance. It does cause cracks on the intake boots, which causes air leaks, which causes melted pistons. Dump the bottle.
Get either the stock crossover tube or pvc caps that fit the boot. Install with sealant and hose clamps.