Experience using Speed Engineering Mid-Length in an 1967 -1969 F-body?

[68Formula]

They make direct swap long tubes, but I may want to try mid-length for some additional clearance without going all the way to shorties. Anyone use these in a First Gen Fbody with stock frame and steering box?

https://speed-engineering.com/products/ls-mid-length-headers-1-3-4-universal-swap-conversion

[Canadianwraith]

I might get these myself. Just tried my new long tubes and they hit in several places