I think you are facing a conundrum. Maybe thinking,' scorched if I do, scorched if I don't'.
You don't know that the Dyna coils are unusable, even though you measure 4.1ohm in a 3 ohm coil.
You dont really know how good the stock coils are until you use them on the road.
You dont want to cut/sacrifice the good Dyna leads/caps onto an unproven stock coil/lead
You might doubt the performance of a stock coil/Dyna lead and cap combination.
You dont want to waste money unnecessarily on fresh leads and plugs for the stock coil.
You would have to perform surgery on the stock coils to ensure the use of good insulated leads.
The copper core lead and ngk 5K ohm caps would probably cost about $20/25 new.
With these fitted to the stock coils, you would then (potentially) have two complete sets (Stock and Dyna arrangements). With the bike in running order (stock coils/ leads/caps) you would then have the capacity to swap back to the potentially better Dyna spark performance. That would be my preferred route.
Without fitting fresh leads and/or at least good caps (with the right resistance level) to the stock coils you may achieve nothing.
Alternately, if the Dyna leads are copper core, surgery and fitting into the stock coils may be as strght fwd as the procedural thred describes. You'd still need to check total resistance thru the lead and caps
It might even be achievable with suppression leads and end fitting, but the surgery would probably be more extreme. However if that operation is unsuccessful the stock coils might not be really left in a proper serviceable/usable state, or require additional mods and associated work.
