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I run an Extreme Automatic's Stage 2 2004R in my '68 with a custom 3800 stall, 3 carbon fiber lock-up clutch, Precision of New Hampton torque converter. It bolts right up to my 5.9 Magnum block and will also bolt up to a Gen 3 Hemi block using a Reid SFI rated bellhousing.

It requires no controller. I have mine set-up so it will only lock the converter in 4th gear and that can be switched on and off with a simple toggle switch. There are other ways to rig it to lock up in the other gears as well too.

The gearing is perfect with a lower 2.76 to 1 first gear and .67 overdrive. It's compact, very efficient and will hold 700 hp at this level. If you want to put around 1000hp through it, you will need to upgrade to the Stage 3 version.

It's the best automatic transmission I've ever driven, and it significantly improved my cars performance. With the looser converter and the lock-up, it's like having a 5 speed automatic.

As for my engine, I used a Hotwire Auto Hotrod Harness with a factory 5.9 Magnum JTEK computer reflashed by Chris at Performance Injection Equipment.