Dne' here's pics of my '66 firewall (note with Factory A/C) just ignore the A/C and the firewall is the same on '64-'66 .
If you get the engine and trans from the late Valiant and they left all the accessory brackets you'll save a bunch of $$ . If not here's pics of the a/c , alt. bracket for the Sanden compressor . One important caviat when selecting an intake manifold it must place the thermostat in the factory location or it will be under the compressor , and that won't work . Edelbrock does make a manifold that will work .
Schumacher Creative services makes the correct engine mounts that put a 318 or 360 directly into the factory /6 K member here’s pics and instructions .
Dodge Dakota mini starter will save you $$ . I got mine from Rock Auto .