67 318 magnum swap

If you keep the power distribution center it's easier to wire it all in especially if you're going to run the gauges that came from the donor. ( well, I thought it was easier so take it with a grain of salt ) The PDC will have all of the grounds and power connections for all of your gauges, sensors and accessories. From there you basically just substitute your ignition switch output to the ignition input in the PDC. Tap into the ground cluster in the PDC and run it to the block. Connect the battery and alternator to the mains in the PDC and she'll run.
If you're not using the PDC, you'll have to power everything from the old ignition switch or axillary switches. That either puts an enormous load on the ign switch or clutters the interior with miscellaneous switches. What you do is up to you. I just like to explain why I did something the way I did ( for information's sake )

The trans tunnel mod isn't too bad. There is a sticky for it in the trans section that's spot on. The hardest part is getting the grinder up in there to cut the cross member. I don't think I cut out enough because my trans is super close to everything ( but that's a problem for another day ).
I've been working on tuning the Consulier lately and spending lots of time on the TM forums, but send me a PM if you have any questions.

You wouldn't happen to be ForceFedMopar from the turbo-mopar forum, would you? ;)