FMX,in answer to your question,I believe the module you need
is the 7 pin. 'Cause GM had a limiter after a fashion w/ their
brain boxes in factory vehicles. Old Gold, in case you wondered
the Mallory coil(s) are good for the HEI. Same same, Pertronix,
even Proform which is low buck (but Gary at American Speed in
Colorado Springs,CO will use a Proform in his drag car)I named
the above 'cause their output is higher than say Accel or even
MSD coils. Like modules same same, have heard good things
about Pertonix modules. Like, MSD's module replacement,also,but
is overkill unless you'll spin to 9,000 grand.Also Mallory coils are
purpose built 1 for up to idle to 5,500r's,e.t.c.And all above fit in the stock location for HEI coils. Hope this helps.