Timing /6 without advance port of the carb working correctly??

I did not know that Chrysler ran full vacuum to the can in early years
I have had 4 slantys, a 65,a 69,a 77 and an 80, and all of them had proper timed sparkports.
>If I was working on your car, I would disconnect that hose from the spark-port, and start cranking advance into it until the rpm stopped rising, without to regard to how much; I would just crank it. Then I would slow the engine down with the curb-idle screw to 600ish. Then I would check that port for vacuum.If I now had zero on the gauge, I would next crank the speed screw back in until vacuum reappeared at the port, just a tiny bit.And then I would retard the timing until the rpm fell to 650. And finally I would reduce the rpm to 600ish, with the adjuster screw. Then I would read the timing.If the timing was not close to spec I would verify the TDC mark with a piston-stop.Having proved or corrected the mark, I would then recheck the timing.
>If I now found that the timing was ATDC, I know that that was normal on certain year slantys.I never liked that and all my three slantys, and others besides, liked a lot more.But to change it now, means destroying the Sparkport sync, so the next thing I would do is check the power-timing, with the Vcan disconnected. If I found that to be in spec, I would be tempted to call it done.
>At this point I have some choices; verify that the carb is the correct year carb for the application, and if it is, I can leave it,or I can mod it. Modding it takes time.
>But if the power-timing is NOT sufficient, then It will have to fix that first. And with retarded idle-timing, this is easy, just advance it. But if you then slow down the idle speed with the screw,that will again destroy the previously established sync. So now it becomes even more important to prove that carb is correct for the year, and if it is , what was Mother's thinking? I have to know if she had any controls on that port or was it direct to manifold vacuum, and if it was, why was the nipple even on the carb?
>Well,well, looky what I found.These specs are for a 69.
Idle-Timing on a 225 is TDC@ 550
Mechanical advance is to be; 2/10*@1100, 19/23*@ 2300, 24/28*@4000rpm.
Vacuum can is to deliver .5 to 3.5* @10 inches, 5.25 to7.75@16inches
All the Carters I found had the sparkport above the plate;for 69. But they were all RIGHT above the plate, so that means it wouldn't take much out-of-sync to activate the Vcan, and it doesn't take much vacuum to get the Vcan excited.
>So as you can see, for 69 at least, Things were tuff for the poor slanty.
>So that takes us back to what I would do, And that is still what I would do.

> another thing to help you is to pop the carb off, flip it upside down,and check the t-port sync.The transfer port exposure should look like a little square, and the sparkport should be above the plate, IMO. Adjustment is with the curb idle screw.
>If the engine idles too slow at this setting, Either; A) the valve lash is too tight,or B) the fuel level in the bowl is too low,or C) the engine is sucking air,or D) the timing needs to be advanced,heehee, or E) the plug gaps are too wide, or F) the convertor is dragging.

Done,Ithink .