318 combo's

I think that software is highly optimistic. If you take a look at some of the "real world" magazine builds they've been doing recently, it doesn't seem like they got those numbers with similar (or more radical setups).

http://www.popularhotrodding.com/enginemasters/articles/mopar/0667em_mopar_318_engine/index.html

http://www.popularhotrodding.com/tech/0901phr_mopar_318_magnum_engine/index.html

http://www.hotrod.com/howto/113_0304_318_small_block_build/index.html

http://www.moparmusclemagazine.com/techarticles/mopp_0409_318_engine_build/index.html

Last, here's a guy with some details about all of these builds and a little editorial statement at the end:

http://www.dippy.org/forum2/index.php/topic,271.0.html

"Despite all of the modifications to these engines, the torque figures for both builds were lower than that of a basically stock Dodge Magnum 5.9 (360) engine baseline dyno test done for a Mopar Muscle article (Magnum Muscle: Serious Bolt-On Power For Magnum Mills). The camshaft was the stock factory 5.9 cam used in Dodge trucks. The only modifications to the 5.9 were bolt-ons; a Mopar M1 single plane intake, a Barry Grant Mighty Demon 750 CFM carburetor and TTI headers. The 5.9 produced 345 HP at 4,600 RPM and 426 lb/ft of torque at 3,800 RPM - an average of 1,000 RPM lower than both 318 builds."

I think in a heavy car like that you're really going to want a bigger cubic inch combo. More low end torque, less RPM to get the horsepower, thus less gear to make it work.

Example: The DOHC engines out of the 99-ish Mustang Cobras make decent horsepower, but you have to wind the piss out of them to get it (and they weigh about 4000 pounds). OK at the track. Not fun at all on the street. They also have OD so low gears are no big deal to them.

I keep coming back to the idea of screwing around with the stock 318 out of my Dart, but it is only going to weigh about 3000 pounds, its not a daily driver and I come from 5.0 Land so I'm used to working with the smaller motors.

Steve