Yet another inital timing question

So for weeks, ive been searching for ways to set my inital timing. ive increased until it kicks back on the starter, even though it hasnt yet. advanced till i got the highest vacuum, about 18 to 19 on the guage. end result is between 24 and 26 degrees BTDC. i have FBO limiter plate and springs. havent test drove it cause i need to top off the tranny fluid, brake fluid and the wife took the electronic gate key card. currently the FBO plate would go on the 10 slot for total of 34. Would 24 to 26 be too high for a from what i know stock 318 with only mods that im aware of is and Edelbrock SP2P-318 intake and Holley 4160?

1973 Dart Swinger
318, Auto
Lokar Cables
Shot vacuum advance can, new one coming soon..

Thanks in advance, no pun...