My '67 Valiant 100 Big Block 4 Speed Restoration

Nice find !

Not sure why you're cursing the rubber mats ... carpet would've done the same if not worse ; it's the jute backing that absorbs and retains the moisture . Rubber mats with the backing removed would be ideal !
But , the again , I'm biased toward rubber mats vs. carpet : easy to keep clean , and I like the cheap-o , budget look of 'em .

Those bent push rods should be okay . Just slap into a vice and use some pliers to straighten 'em ; then , wrap 'em in electrical tape .

The 7.25" diff is also okay to re-use . They hold-up fine behind anything ; my '70 Hemi / 3 speed manual converted Barracuda has the 7.25" with 2.76 gearing , and it's just fine .

The Imperial exhaust manifolds will be good as well . Simply drill a hole through the driver's side manifold with a hole saw and slip the manifold over the steering shaft prior to slippin' the motor in . Hold the manifold to the fenderwell with some Temporary Scotch Tape while you're jammin' that 413 in there .

Okay , now that I'm done being an *** ...

Seriously , this is a rad project !! And , yes I was serious about the whole rubber mat deal , just before I started being a stupid head jerk .

I truly applaud your efforts and labour . Thanks for the updates !

Have yourself a great week .