thanks heaps guys i am much better informed. i have been building v8 fords chevs holdens, ect for years. i have only owned one chev six in a c 30 truck i had . i think if i balance it up only rev it to 5-5500 with the turbo and a 350 box it should be ok . again thanks sean i have added a photo of the old girl it looks a bit like a 50 model chev .