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MSD w Boost-Retard substituted.
This might have some potential and involves disabling the Vac/Boost-retard canister on the distributor. It can gain many of the advantages we seek plus having timing on boost come in, in a more progressive manner. (I suspect if I was building a 930 today this might be what I actually do a version of this but play with the mechanical advance. )
There is a limitation with this unit in that it can only retard timing a max of 15 deg. Thus, if we want total timing on boost to be at -16 we can set total timing at 4000rpm at -31. This is better than -26 but short of cruse ideal so we should see some improvement. If total timing is at -31, 18 deg of that would be from mechanical-advance. Thus, timing at idle would then be -13 which should be a solid improvement but probably less than the motor would take. This approach might benefit from a softer spring in the distributor that would bring in total advance in faster. Optionally one might hook up the Vac-Ret hose (closest to the motor) if desired for a bump in rpm during cold start and bring idle timing to about -5 deg.
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