will theses K-members work..

No '67 and up K-frame fits '66 and down, at all, everything is different. The frames are ~2.5" narrower on early A's, the engine is mounted over 1.75" further forward in relation to the frt. wheels etc.....etc....the spools started in '73 as mentioned, the 6 frames are all diff from 8 frames from '67 up on A-bodies. Spools included. As mentioned early on, this thread should've been moved, but morphed into belonging sort of. With conversion mounts readily available, I agree, buy 'em & bolt it together. The brake upgrade need not mess with the change in steering gear/linkage as also correctly noted above.