64 valiant wagon-5.7 hemi

Nope dont need a v8 k member,just some shumaker mounts and a drop center link.Sorry dont know about the oil pan as there may be some differences about the magnum I am not aware of.

http://www.engine-swaps.com/

I don't think Schumacher has any new hemi mounts. The only I am aware of are from TTI

The 67-72 style is here http://www.ttiexhaust.com/ComponentParts/57MMA.htm
They also have 73+ spool style now
http://www.ttiexhaust.com/ComponentParts/ComponentParts.htm#em

I'm not sure what you will need for a 64, but I'd guess it is highly unlikely your slant 6 k fram could be used.

Oil pans can be bought from a number of sources.
Weldtech http://www.weldtechstainless.com/wtstainless_004.htm
Milodon http://www.jegs.com/i/Milodon/697/31000/10002/-1?CT=999
Street and Performance http://www.hotrodlane.cc/PDFFILES/5761392oilpanmeasurement.pdf
Probably some others as well