Gas Tank

The guy before me had the car and let it sit for about 12 years before he did anything with it. i dont know if there was gas in the tank or not, but the tank does have a big dent in the bottom. and i believe this is the second time (atleast) that ive had vapor lock, i was driving it yesterday for about an hour and it started getting shaky when ever i let off the clutch, so i pulled into a parking lot (it died on me while pulling in, luckly i had enough momentum to get into a parking spot.) and i also have had a filter before my fuel pump and had to replace it last winter, i shook it a little bit and it sounded like it had rust in it (it was metal, not clear). and i also had problems when i had too good of a seal on my gas cap, was there no gas tank vent on a 65? or is mine clogged.

and my filler neck is rusty.