[64-389]

Thank you both! That was hugely helpful.

The center carb you guys ID’d has the number 7019927 (photo labeled “Center Carb 2” above) and the 2 dumps have the number 7011997 for both. Based on some research here on the forums, those are like 61 carbs? Should work though right? The plan is to put this on my 64 389.

3 others have vents coming out of the thermostat. Does that mean all 3 of those are 59 & older?

Thanks again!

[Dick Boneske]

That intake is a '61 or '62. It will work but does not have provision for PCV like '63 Tri-Powers used. You can drill and tap to add PCV to your manifold. I can send pictures to determine location for the 1/8-NPT ports of you need.

Or, if you want a '63 intake manifold, I have several.

[Kenth]

7019927 is used for the 1961-65 M/T center carb.
7011997 is used for the 1959-63 outer carbs.

Your center carbs #2 and #4 looks like genuine Pontiac Tri-Power units.
#4 for 1965 M/T, #2 for 1961-64 both A/T and M/T.

Check this out (thanks Jon at "thecarburetorshop"):

https://www.thecarburetorshop.com/Tripowerspecs.htm