If anyone has (or knows of) anything, in pieces/for resto - i need something to do over winter eves

Motorbike or similar, but could stretch to a car.
I am keeping half an eye on barn finds.. I quite fancy an old bike to plod around here on, 30's to 60's maybe.. I also fancy some green lane -ing on something road legal, ideally a 4 stroke 250/350 sort of thing
budget around 1K or below to buy.
heeelpp
John