Charlie, you might find this interesting - maybe even useful:

I've read that most automotive coils have an inductance value between 4 and 10 milliHenries. The VB921 coil driver in MS is current limited to ~ 6.5A. Using the OE spec coil primary winding resistance of .72 - .88 ohms, a 6.0A current value and the 4 - 10mH inductance limits..... and plugging the values into the MS calculator, I get a dwell range of 2.48 - 6.59 milliseconds.

If I use the mid-point values, I get 4.47 milliseconds dwell time.

Odds are, I can increase dwell time to where you've set yours - around 3.5 or so. I'll try it and see if the coil gets hot and if the engine starts better.

I'd sure like to get my hands on an LC meter for a few minutes to see what the coil inductance value really is. Would an automotive shop likely have one?

Frank