Where do you have the timing set? You claim to have a "hot" cam, and these "like" a LOT more initial advance than "normal" and ESPECIALLY a lot more than '70's "smog" specs
You probably need to get the distributor recurved. I don't know specifics on /6 distributors, but the general idea is to buy an aftermarket (from Jegs or Summit) distributor "spring kit" which will have a selection of LIGHTER springs and will allow FASTER mechanical advance.
But you ALSO need to SHORTED the total amount of mechanical advance. This is because "stocker" (especially "smog" era distributors) have a VERY LONG and slow advance curve. You may have noticed that some "smoggers" call for initial timing AFTER TDC. This needs to be bumped up considerably for "hot" cams
I can't offer any specifics, I'm not a "6" guy
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