Sounds like a reasonable diagnosis. Yeah, keep the bolts and hold downs sorted to which holes they go to, they are not all the same and have a specific order.
I wasn't sure what you need the new carb for, there wasn't a lot on it as far as enough vacuum ports for everything and and the missing choke linkage and vacuum can that you would have to transfer over? And you said your solenoid was not working, so if that is still the case then you would need a new one with either your current carb or the new one?
BTW, I think after looking at my carb, yours, and the diagrams I have the passenger side vacuum ports figured out. Starting with the choke vacuum, your can draws from a port that is behind my electric choke, so my can actually draws from another port closer to it. I assume this is a timed vacuum port due to how high up on the carb it is. My carb has two plugged holes below the electric choke, while your's has the EVAP (charcoal) plugged into the top one and the distributor vac adv into the bottom one. On mine and in the '77 diagram the EVAP is located high on the other side and is timed vacuum, while the advance is coming off the low full port that your EGR uses. So my guess is despite how close those two ports on yours is, the upper one is timed for the EVAP and the lower full for the vac adv. Inside, they are drawing vacuum from opposite ends of the carb. For some reason in '73 the EGR was full manifold vacuum, and by '77 at the latest it was timed vacuum. BTW, do you have the EFE flapper valve on the exhaust manifold?
Turn your phone sideways to widescreen so the viewer can see everything, I like to ogle while I listen.
I think I hear the change when you spray it. The intake sealing was a common problem on inline Chevys, that's why they went to an integrated head and intake from '75 to '78. But then they had head cracking issues and put the non-integrated top end back on for '79.
I did the exhaust on mine for IntegratedJ because he wanted to know what the Z28 exhaust sounded like on it. I did some under hood video but I guess I didn't upload that:
https://www.youtube.com/watch?v=cxzW7miIM6shttps://www.youtube.com/watch?v=yMySPecpiJAI really want to do a tuning how-to video for the inline six when I'm done organizing the garage and got it back together again.
