No spark, eh? Well if the thing indeed does have points, they probably need a good cleaning and regapping.
I'd pull 'em out completely and then clean them with a whetstone or medium sandpaper, then polish with crocus cloth. You'd have to find the points gap spec in that manual.
If you'll post that link, I'll download the manual so I can follow along.
BTW have you checked out the CDI electronics ignition troubleshooting manual? It is posted online, with an irritating format. that's because they want you to spend $48 and buy the "unirritating" manual!
But the Chrysler section is right up front, so you don't have to thumb thru much of it. You'll need to find the applicable section for that older ignition.
One thing I was reading about on a different boating forum, is that if the distributor is a points module, you could adapt any type of CD-ignition to it, or even convert all the way back to points-and-battery operation. You'd need a ballast resistor if you use a coil without internal ballast. Also add a condenser to the points, if converting back to standard ignition.
They had a warning not to use an automotive, oil-filled coil. But isn't that what the old Inlines ran, with the dual-coil setup? Seems to me they were glorified car coils. I never heard of one of those blowing up, and I know there's been plenty of Mercury Dudes who have replaced one of those bad coils with a car coil!
Before spending HUGE dollars on the OE Chrysler replacement stuff, you can replace that with a Chrysler automotive CD power pack. These were commonly used on 70's Chrysler products. A lot cheaper than the Outboard ignition parts.
Any points setup can be made to work with the Chrysler box or aftermarket boxes such as the MSD 6A, which is about $250. But would be Light Years ahead of the 70's Chrysler outboard technology, and far more reliable.
I also found an article at a hot-rodding site about using the Ford TFI ignition module to fire a points system. These can be found Dirt Cheap on eBay, BTW.
This is a good read:
www.jalopyjournal.com/forum/threads/adding-cdi-to-points-ignition.1253424/
Here's the writeup on the TFI ignition module:
www.49ccscoot.com/manuals/FORD%20TFI%20electronic%20ignition.pdf
This one has a ton of good info that I'm sure you'll be highly interested in:
www.smokstak.com/forum/threads/1969-chrysler-75-hp-outboard-ignition-coversion.52047/
Anyway, I'd seriously some sort of conversion, before laying down Big Buck$ for the outboard ignition parts.
Well, hope that helps. Let us know what you run into next!................ed