Just wanted to say....I did install a 'small cap' HEI dizzy in the slant six. The distributor is from a mid-1980's chevy V6.....aka
S10 pickup. I did some testing with a standard round oil filled coil
and the HEI 'epoxy filled' square coil.
The round coil will reliably throw a spark about 3/4 inch, and the HEI coil will reliably spark up to about an 1-1/8" wide gap.
It runs really nice now, starts very reliably as well.

The other thing I did was toss the old prestolite alternator that was over charging, and installed a small Denso unit off some Toyota car. Nice little alternator, and the voltage is rock steady at all engine RPM now.

Just got in a new clutch disc...(oil spray setup)..the old one has always stuck to the flywheel, and I intend to fix that annoyance shortly.

dk