With the adapter?
with the factory cast 1970 adapter, just like the one in the picture, post # 13
the early 273 have a different angle, they tuck in more toward the block
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With the adapter?
No, with some headers you need the 90° adapter and the shorty filter.im not sure this statement makes sense
isnt the whole point of the adapter that you can run headers without having to use a smaller filter?