Need help/advise on which Sanderson headers to go with

[1969 Project]

Hi Guys! I have been looking into the Sanderson headers CC1_158 and CC10_158. The PO has some crappy block hugger style headers that are leaking pretty bad. I spoke with ECE and they told me they use the CC10 in our trucks. I have looked on the forums and I only saw one person that is running the CC1. Does anyone know if the CC1 will have any fitment issues for a 69/Automatic with motor mounts in the forward position? . I wanted to try to stick with the block hugger style since that is what is on the truck to avoid having to do too much to the exhaust pipes. Any advise is appreciated, thanks fellas!