Big block intake swap questions

I have reused valley trays. Even though it may not be recommended you really can't hurt anything by trying.

I kind of thought re-using the valley tray was no big deal but wasn't sure. I may just get one though if it's cheap enough, just in case the one that's under there is somehow toast.

Your kickdown linkage may or may not work properly...

Does the geometry of the linkage change when using a different rod? Do I absolutely need to get a complete throttle/kickdown linkage set from a 4 bbl car?