Link has been corrected. Apologies. Do not know specs on D1948A, but if you get the latest GM/Delco version, your probably OK. Thought you were using 8-pin but now realize it's 7-pin.

Here's some...

Maybe too late, but consider:

IMO, one issue often overlooked is matching the coil with the ICM for high RPM performance. At high RPM, the ICM has to do 2 things:
1. Provide maximum primary...