Yes. Not sure what vacuum advance the TA distributor uses. Make sure you know how to use it. Some only adjust spring pre load, not amount of advance.
Just throwing it out here.. the process I use to check the amount of vacuum advance is first check initial timing while idling and the vacuum advance disconnected. Place dial back timing light at 0 at idle, use hand held vacuum pump to fully engage vacuum advance, and with vacuum advace fully engaged see how many degrees it takes to get dial back light back to zero. In my simple mind it removes other variables, and you can see at what vacuum level the advace begins and when it’s all in.
The only problem with that is the mechanical advance. As you add vacuum advance, the idle speed increases. That may trigger some mechanical advance, and you would be including that in your dial back observation. As I said, if you know where your mechanical advance is all in, just connect the vacuum advance and take a reading at that same RPM. Note the difference and subtract.
I think Larry posted this before in his Power Timing thread. It lists different vacuum cans with NAPA part numbers: https://www.460ford.com/forum/42-ge...uum-advance-101-good-article-gm-engineer.html
I have a few sets of rods laying around from junkyard find carbs, one set is a CZ set. tip measures .0950, nearly double the CK rods measurement of .0530. Is this too large of a jump? WOT was 10.8, if the .75afr to .100 change is to be believed, then that would put my WOT AFR well over 14. The next size up rod I think I will try is a BT, or AT/CT rod, at .0600 and .0670 respectively.
I don't know about the rods ( Holley Guy) but most like AFR of 12-12.5 to 1 at WOT. Most of my cars idled around 13 to 1 and at cruise were around 15 to 1. Seemed to run pretty good.
Also this is the response I got from TA about their 350 HEI dizzy: "Hi, The distributor has 20-22 degrees of mechanical advance built in. This is controlled by the weights inside of the distributor. The that the mechanical advance comes in is controlled by the springs in the distributor. To adjust the total amount of mechanical advance or the rate that it comes in (XXXX RPM-XXXX RPM) requires changing the weights or springs, respectively. A lighter spring will result in the mechanical advance coming in sooner, a stronger spring will result in it coming in later. The total amount of vacuum advance that will be added under vacuum can be increased or decreased by inserting an Allen wrench into the vacuum port nipple and adjusting it up or down. The "rate" that the vacuum advance comes in depends on how much total vacuum advance is being added. The more vacuum advance that you add, the faster it comes in, etc."
Actually, I think I've settled on a set of CL rods to replace my CK rods. CK Rods are .0527, CL are .0667. Good starting point I think.
