The BTM is $650. This distributor is $550 but Charlieny will have to work his magic as they don't offer a Flathead version. I feel the cost will be worth it because it's more tunable than a btm.
https://progressionignition.com/
I adjusted my total advance to 21* this morning. I'm waiting for the temp to go up so I'm close to where it was yesterday at 86 degrees.