12 Second N/A Slant 6?

In 2006 we had my Cuda on a portable chassis dyno, at a Mopar race.
358 ft/lbs@2950rpm, and 204 hp at 4500 rpm. The HP curve was just about flat from a low of 180@2900 to the peak of 204 at 4500 and down to 195@5600 where I lifted. The torque and HP lines crossed at about 5,000rpm and 200 ft/lbs and 200 hp.

I say go for it and keep us posted.
I don't have much money in my motor. You've heard the saying "all throttle, no bottle"? Mine is "all bottle, no throttle". It only runs mid 16's on motor. My 66 Valiant will run mid 14's on motor.

TQ & HP always cross @ 5250 RPM

204 RWHP is about 250 HP @ the crank.

A 3.91 gear on 28" rubber would cross the traps doing 107MPH @ 5000 RPM.

It would take lots of TQ to do that in 12.99.

I'm thinking a little more top end power, perhaps redline @ 5500 RPM?

That would pull a 4.56 to about 5800 @ 106 MPH.