Help from experts wanted.

No headers? no cam? AG almost waste of time and money, especially in Iceland.
650DP is fine for now.Fix the 650 if she stumbles.
Want more performance? add 20 to 30% more rear gear and call it done.

Del (67 art 273) hit a homer in post#4
followed closely by Ol Dodge in #8
You didn't mention your elevation, but I see some points over there are near 7000 ft, and that is gonna put a big monkey wrench into the equation. Ima thinkin that old girl wants cast iron up there. I you are driving that car with a 2000 ft elevation change, you are gonna have trouble. And the single plain Torquer is gonna make it worse. You will need a small plenum dualplain, cast iron is good, with carb heat, and a heated air intake to stabilize the inlet air temperature.Then tune for that.
Forget the AirGap for that environment
The Torquer will work pretty good at near sealevel, with a properly set up DPcarb