HRR688 question

Sounds like a lot of 'Who shot John'......
There is PLENTY of dwell at idle & lower rpms...& it doesn't need any more. It is at higher rpms that not enough dwell can cause misfires...

I do not know the ign module you are using, but it could have electronically modified dwell. Get it running, check idle timing. Then, use another box, check & compare the timing.