Today, dollar for dollar, is the 318 faster than the 340 ???

It's not quite that simple when you decide to sell a nice 1969 318 Dart compared to a '69 340 Dart.
And the 360 crowd won't like this but the same applies to a 1969 360 Dart.
It doesn't have to be a restoration to realize what the 340 brings to the table.

If its not number matching it don’t mean ****. You will never your costs. If you think it does your having a fantasy. The only non numbers matching car that brings big money is a vintage muscle car with a modern motor.