OK good, didn't know if you were now OK with your original post about cutting/bolt on. Seems you are.

There are "block hugger" headers, But Ram Horns are GM block huggers too. Be sure to search on this site (V8 swap), find members and PM them to see if Ram Horns worked....and search the web. Your deal is a common swap. Maybe Carl knows.
Originally Posted by bartamos
Usually a set of Ram Horns will do the trick.

Corvette Ram Horns are larger diameter passages.



Lots and lots of posts on V8 swaps here. Filter it all and do what makes sense to you.

Rochester, MN. https://rmn.craigslist.org/pts/d/ram-horn-exhaust-manifolds/6366605391.html

https://rmn.craigslist.org/pts/d/small-block-chevy-rams-horn/6364029551.html

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn