Im an out in the field Prime-mover driver. I responded but my post was lost.
IMHO, the way I understand it, You need to set up a crank position sensor on your crank balancer and an additional cam sensor "under" your Autolite 1968 points based distributor. That's two three wire Hall sensors making two signals of a similar type to one kind of Chevy HEI 7 pin module EST system. Ford Australia and GM Holden used the same Bosch 61 series distributor to do this way back in 1982 ( Phase 3 Starfire Four and XT5 3.3 Six) to 1985 (Ford Falcon XF pre-unleaded and Unleaded).
Check how:-
1.67Straightsix on Ford Six and
2. Devin vanderhoof with his MSD/ Holley crank sensor and cam sensor 5.0 White Fox 1000 hp V8 drag racerand
3. the 4.0 turbo stroker Jeep Dorton on youtube did it.
Holley wants you to use its HyperSpark ignition system.
On Prox sensors Holley has mastered it, but you have to integrate parts and get a clean three wire signal foe the Sniper to work.
Dont ring Devin vanderhoof at 1am, but he knows how to solve your problem. Don't let a novice know it all grin funk you with bullsh!÷.
This is a simple sensor issue.
When I have time, I can send you links but I work 70 hours a week and have given you the answers out of courtesy, I can't spoon feed you if your trying to be thrifty. The issue is: You are trying to avoid a purchase. The solution is to use a thesameguy and 67Straightsix style cam sensor while still using a points Aurolite/ Duraspark I body.
So you are being structured and specific, but somewhere, you are going to have to engineer a solution.
Fords Australian October 1980 to 1991 Bosch Duraspark and Ford EST TFi were there chosen solution.
Like bleed back retuen line carburation, and emission control delete, carb PCV and Weber 2 bbl carb set up, everyone thinks its as easy as ABC. But its not.
I have very specfically described these systems to many people who have X flow 200 and 250 sixes. Ignition -wise, Re-sciencing something Ford Australia did with US parts requires
1.basic reading,
2. then understanding,
3.then discussion
4.and then feedback with a proxomity sensor specialist.
None of those except 67Straightsix or Devin vanderhoof have a g-d damned idea what you need.
So keep focused, but youll have to spend sometime understanding what your Holley Sniper sensors need exactly. The problem is as 67Straightsix found when using his Standard Motor Products 51 or 74 series crank and other cam posotion sensors. Holley work on the first signal being the rising from negative to positive. The data wont be accepted by the Sniper ECM unless its EXACTLY right.