I have a chance to pick one of these up that runs and drives. is there alot of parts out there for these?
No sir, quite rare trucks. Whatever crosses over from a 521 will be a bit easier to find, though.
im assuming the motor will need a rebuild soon any rebuild kits? any help would be appreciated as im brand new to th datsun world.
If you still had the stock engine, you'd be SOL. Luckily for you someone appears to have swapped in an L16 from a 521. Parts for that are very, very common. Same engine used in the 510, and similar to the engine in the 610, 710, 200SX, A10 (aka 510), etc.