I have what started out as a 78 k 20 that I use for bumper to bumper pulls and sled pulls. I currently have a built 350 with a 400 trans and np 203 tcase I am wanting a lower gear ratio and have a 700r4 with a 208 case. Would this be a good swap and what all would be involved? I'm not worried about the speedo or overdrive for the matter. Will the 700r4 work with out a kick down cable? Would it be cheaper to just put on the 208? Thanks for any and all advice.