I have a 1984 k10 Chevy pickup with original 305 V8.  I recently purchased an HEI upgrade kit from Summit, which inclded new dust shield, cap, rotor, e-clips, counter weights/springs, adjustable vacuum, and new 4-pin module.  I did not know what was meant by a 4-pin module until I disassembled my original distributor and saw that a 5-pin module was hiding in there.  

I tried EVERY option I could think of to make the upgrade kit work.  But I was unable to make the 4-pin work in place of the 5-pin.  I even tried leaving the existing module, but include the rest of the new pieces; however, this still will not work because then the new pieces that connect to both sides of the module will not properly connect.  From research, the 4-pin module does not have the "knock sensor" that the 5-pin module does (and hence is one pin less).  

Is it possible to convert an original 5-pin module to a 4-pin module without sacrificing / jeopardizing engine performance.  Whould I have to change out the pigtails that the 5-pin module plugs into?  How is this done?  Where can I get these pieces?

Also, there are a few reputable online shops that offer a complete distibutor (from the helix gear at the bottom to the dust shield on top), however these all contain the 4-pin modules inside. I would like to get one of these new 65k volt complete distributors, so I need help finding a way to convert the original 5-pin setup to a new 4-pin setup.

Thanks,
Tony.  

Did you call Summit to see if they had a kit for a 5-pin module?