Head Gasket experts...check in....

Unless OP has massive dynamic cylinder pressure, Ima thinking that this is a massive pressure issue from some other source, such as preignition/ detonation, and 140 ftlbs isn't gonna solve this gasket problem.
While 34* power-timing sounds about right, if perhaps 2* high for the Eddies, mine does not arrive until 3400 rpm. In this way I can burn 87E10 full-time, and my engine has never burned anything else, at the aforementioned 185psi.