Gwynne Spencer on the relationship between torque and compression ratio:

The improvement in torque should be about equvalent to the improvement in BMEP which is the ratio of new CR divided by old CR - result taken to the 0.4 power

Example - if you had 10:1 and now have 10.1:1 (10.1/10.0) to 0.4 power is 1.00398
OR 100 ft lb -> to 100.398.

A lot of people think that raising CR is MUCH more effective than it actually is.

Gwynne quoted this eqation from "Design and Tuning of Competition Engines" by Phillip H. Smith