Your thoughts on intake/exhaust choices ??

So I spent a lot of time with Performance Trends simulator looking for the same thing on the wife's Dart. All the torque I could get under 3000 RPM on the 225. You have done most everything you can do.

1) Crank up the compression (I went to about 8.8:1)
2) The 1206 puts in the max 200 psi cranking pressure you want for a nice street engine (I have this as well) with the above compression.
3) What really seemed to help as well was Dutra Duals then take them right behind the transmission crossmember for the "Y". That was the length required for scavenging at low RPM (I did this). Also keep the pipe diameter small from the Duals to the "Y". Too big for the cubic inches and the exhaust pulse will die out before it get to the "Y" and create a backward pulse in the other half of the "Y". Think I used 1.75".

Don't over carb it for torque. Lots of CFMs are for high RPM. Around 375-425 CFM seems like the perfect spot for the above components. I went with the Offy dual one barrels and new Daytona 1904 knockoffs. The Super Six would be all you need.

There is a limit to how much torque you can get and have a streetable motor. Cubic Inches, cranking compression and exhaust scavenging are are the main drivers. The first one is set, second one is set by compression and the camshaft and the third is just icing on the cake.

If you look at the equation for Torque in an engine it is simply
Torque = displacement *MEP (Mean Effective Pressure)
you can see there is very little you can do once you have the cam that give you as close to 200 PSI as you can. After that it is all second order effect like scavenging with the exhaust collector ~45" back for low end scavagening.