Educate me on the various six cylinder engines.

How do the AMC 4.0 I6
Chrysler Slant I6
And Dodge truck 3.9 V6
Compare technically?

Which made more torque per cubic inch?

Which was considered smoothest?

The slant six has achieved legendary status for durability
But can AMC I6 engines last as long?

Aside from the engine factory tooling issue of making the 3.9V6 alongside the 5.2 V8
would base Rams and Dakotas have sold better if
they had updated fuel injected slant six engines
rather than 3.9 V6s?

Would a slant six diesel have made sense?