Cab we've been talking on these boards for 20 years or more, but I have to admit I don't know how much of a purist you are.
Maybe I'm not too observant LOL.
If you have to have a mopar style ecu then don't read any further.

For non-msd type applications, since giving it a whirl I have become a big fan of the GM HEI module + Ford TFI coil combination,
triggered by a regular Mopar electronic distributor.

I liked it enough to start a thread about it:
click to read thread about ignition

The coil is Std Motor products FD478T or equivalent.
1990 F150 with a 351 would be the application.
The ignition module would be a std motor product LX301 or equivalent.
1979 Corvette 350 would be the application.

Together they will run about $30.

It's no MSD, but it makes a pretty strong spark: https://www.youtube.com/watch?v=3iYv4H26SRs&feature=youtu.be