i had a 496 built here in ky i took a bare block and bare heads to my machine shop (not mine but where i go) with machine work all parts put together it cost me 5,500. that was with the stroker oil pan i had vavle covers carb and dist. that was including head work and new bigger valves and springs. eagle rotating assembly and je pistons. i have since changed to roller cam and rockers. it is a pump gas motor making almost 600 hp. it has been together several years now without any problems and it hasnt been babied. not saying anything against anybody but 20,000 for a 383. i think ill just keep dealing with my local guy