Jamming in a big block?

Angel wing headers are just what the doctor ordered. So much stuff solved with an up and over design. The block physically fits with no problems, even steering is doable with Hi-po logs and shimming motor 1/4" to passenger side. You can buy 'derby' headers and mod them as they are already flanged, out and up.
https://www.decheaders.com/product-category/headers/8-cylinder/bb-mopar/