this is a very general question and i appologize for not having something specific to ask...i really want to start some serious work my 35 ford and i guess the first place to start is to get the engine running...

it's a 283 from a '58 impala that my dad put in when it had about 15k miles on it...the engine now only has about 20k on it but at this point it has been sitting for at least 30 years...so my question is where should i start to get this thing running? what would you guess will be ok to reuse and what will need to be replaced...what is a good source for 283 parts? anything you guys could share with me would be greatly appreciated!