at some point im going to be putting a 455 im building into my 1980 cutlass supreme and would really like to go with headers .are there any headers i can use that aren't well over 1000 dollars?rarely do anything come up for sale used in my neck of the woods .part numbers would be helpful ,i put the thorton w/z's on my 76 455 supreme and would rather not go that route this time. thank you ,jeff