It won't hurt the distributor any, but it could fry your coil.
Chk the specs on your coil and find out if it is internally resisted and/or if it can take a straight 12 volts.
Although these HEI units can use quite a few different coils this unit was intended for the purist look and will work with stock coils as well as HEI coils.
A stock coil will not give an HEI ignition with the hotter spark, but it looks stock.
I gotta say this though.
I coudn't see any point in using the HEI module without an ecoil, or a similar output coil.
Other than stock Ecoils, MSD blasters, Accel coils, and a ton of others work with the HEI modules.