I'm going to replace my steering box soon & it looks like that job will require removing the header to get it out. I'll need new header gaskets then, correct? Any recommendation on materials or brands or suppliers for header gaskets? ('69 Road Runner, 383 4bbl, 4spd, power steering, no air) The collector gasket: I'm not sure what size to order. I think my headers are Hedman. What's the likely size of the collector gasket? Is there any "donut" gasket there where the pipe connects to the collector? I'm trying to get all the parts that I'll need ordered now. Thanks for any advice or comments!