There are a few options for mounts for A bodies.
- TTI - they have options for biscuit and spool mounts. Their mounts are designed to work with their headers. Accessories I actually have a set of p/n 57MMA that have never been used if you are interested in buying them.
- Holley - only works with spool mounts and moves engine forward 2". Also requires you to use their trans mount to accommodate the forward position. Holley doesn't have headers anymore, you can use their manifolds or modify TTis to work.
- Shumacker- Don't know much about these.
- US Car tool - universal mount requires fabrication.
A remote oil filter will be required unless you make your own mounts.
The durango front drive accessories should be fine. A car accessory drives will require clearancing of the right side frame rail for the alternator. The factory AC compressor on the car accessory drive will not fit without heavy modification.
Sublime Technologies, formerly DIY Hemi can supply you with a quick run harness and ECM. They are also a very good resource for information.
Any smallblock transmission will work. A 904 or 727 will present some challenges for the kickdown linkage. A833 will require a pilot pushing for the crank. Modern transmissions will require tunnel modifications.
Holley has a nice cast aluminum oil pan. It will require you use 73 and up steering arms. Milodon and Kevco are some other options.
A hemi swap into an A-body isn't for the faint of heart. Do your homework and be prepared for a challenge.