hey. i've done this swap. use the schumacher motor mounts they advertise for 63-66 abody. but they work. and if you call them they will tell you that. here's that link
http://www.engine-swaps.com/Pages/ProductsYear/63.66aBody.html.
use the A904 trans the variations used also were A998, and A999. which are the same case size as the A904. so those will fit in place of your old slant 5 torqueflite. i have one if you can't find one. your not that far from me. your converter will be fine if you use the b&m flexplate that is for the externally balanced 360. here's that link
http://bmracing.com/?wpsc-product=chrysler-sfi-flexplate-‘71-’92-chrysler-360-wtf904
the heater box on the fire wall just remove and make a flat plate to bolt in its place. pre 70's exhaust manifolds will fit and so will first gen dodge dakota 318 manifolds. i used the ones from a 92 dakota. and then use a mid sump oil pan. and your pretty much there. you'll need to decide which water pump after you find your radiator. pre 70 exits on one side and after 70 on the other side. this one is also alominum with fins and also has been refered to as the ac water pump