904 sittin for a decade?

it will in all likely hood have some rust inside if the thing wasn't sealed and oiled completely. you should be able to build your 904 for the price of a good race kit ($150-$200)plus what type of vb you want and other upgrades. you should have between $500-$600 in it. this is of course if you have the few special tools to do it yourself. if you just want a stock rebuild about $70.