Flex plate bolts witness marks on torque converter

4spdragtop said
Sidenote, I have another(unknown) TC, is there a way to visually tell if good to go or not? Can you "mix" lockup tc with non lockup trans?

Without doing mods to the converter and/or the trans, this is the situation. `1960-1967 trans and converters go together. 1968 up non lockup trans/converter go together. Not sure of the 1st year of lockup, but lock up converter must be used with lock up trans. All three versions of converter and trans have splines that have a different count, and must be used with the corresponding part. It is possible to mix and match different parts, but mods are required.
PS: My 66 Barracuda race car had a early slant six (small crank pocket), a 65 cable shifted 904 with a 64 full manual valve body, and a push button shifter in a console between the bucket seats. The trans had the 68 up input shaft and related parts, and the converter was a 3200-4000 stall (depended on engine) custom made with the early small pilot, and late large spline. That way I could use the same converter with the early engine, or late engine with the crank adapter ring. Also the late non lockup trans (as is) or the early trans by swapping the input shaft. So any engine/trans combination.