Matt you can run it fine...just a couple of sensors are not compatible....just get the later harness...and the later 5.7 Cam and crank sensors.

The guys at MSD don't know sh1t unfo.

The other issue is the tune that is provided by MSD..follow these two links and learn all about both issues........

http://moparskunkwerks.wordpress.com/27-dec-12-making-sense-of-the-sensors/

http://www.forabodiesonly.com/mopar/showthread.php?t=254123

67 RO23 clone with 6.1 SRT Hemi and dual quads. Soon to have Drag Pak induction and Throttle body.