I screwed up!! Advice please?

So I’m going to peek at a valiant this week, circa 1974. IF the front clip is in good shape, this would get me disc brakes, 8.25 rear end, floor shift/hurst?
and an electronic ignition.
I’m reading 67-74 frame rails/ front clip will be the same as my 68, with the exception of appearance of the inner fenders, but I’ve also read 74 is different...
Is it? And if so, how can I tell visually?