K frame install alignment?

All,
Thanks for the suggestions, it did remind me that I do have the 3 book 1971 Chassis/Body series. First time I've cracked them open and yes there are dimensions given for Valiant which I think would work. I thought I was going to be able to mount this today, just spray some rust reformer on the bottom and outside frame rails, but OH NO, too much crud, out come the wire wheel and screw driver scraping begin!!