Hoover300
hoover convertible motors (704 motor you mention) or any parts are completely incompatible with a 62-64 hoover. nothing is the same. the motor was bigger, fan had 2 more blades and handle bail, bag design were completely different. the 62-64 also only had a single speed motor, not two. the only parts that could be compatible from a convertible, IF it was a model 65-68 only, is the switch and cord. maybe the headlight bulb. nothing else
this is so trashed and rusted this is unsalvagable, and this is coming from someone who has restored NASTY machines. you might be able to save the wheels and handle spring. everything is so lost its not worth it. except maybe as a planter.