Doug's or TTI headers

No problem, glad I could help. I should add I use the stock mounts, right side modified to accept the 340 block. I have heard the Shumacher mounts position the engine a little bit different than the stock mounts but in what way I am not certain or if it would effect fitment of the box and coupler.
When I jacked up the rear of the K frame and rebuilt my cradle, it was obvious the Bergman coupler would work.

Thanks, again!