I am actually using Williams headers on a 261 with an 848 head and an oil filter. I did relocate the oil filter to the inner fender. Worked out pretty good. I didnt install any heat riser setup at all to the bottom of the intake. The exhaust is still rather quiet unless you thump on it. I think they are 30 inch glass pacs. I bought the whole kit from National Chevy. Included everything from the headers to tailpipes with hangers and clamps. Ive been running it for They Probably wont have a set up for application tho. Not using that restriction of an air cleaner anymore either.
