Alright im building a 383 for my street truck and im doin it on a budget i would like to get 400 to 450 horse out of it my problem is i dont Have te money to go dump on a set of heads so I would like to know what Chevy production head will support these numbers ive looked into he vortec years and everything ive read say they cop out around 350 and cant handle over a 470 lift cam any info would be appreciated thanks