Like everyone else says, put in a stroker crank. You will also need a lot more cam. That Mr. Six Pack cam will run out of steam way to early with a big motor. Hemis like to rev. Don't hold it back with a 5000 rpm cam.
I've been there and done that so I can completely relate.
The torque from a stroker motor rocks, but too small of a cam and it will run out of air waaaay to soon.
Depending on if you go with a flat tappet solid lifter cam or roller you can get a custom ground cam for your combination for starting at roughly $200.
Obviously a roller cam will cost more.
