First, apologies if I describe anything incorrectly or misidentify a part below... Please correct me so I will learn from my mistakes.
So I have a 1965 GTO which I thought had an original engine but after research I am almost positive it's not. I have shown it to multiple people who have all told me various things (You have a 398... You have a 400... etc.)
Recently I noticed that as the car warmed up I would almost stall when giving it gas from a red light or stop and I could smell gas as if it was spilling out, etc.
I decided to bite the bullet and skip rebuilding the carburetor as it's an older Carter 9635SA and am getting a new Edelbrock 625 installed (basically new version of same carb).
Since having the car, there's been oil and grime building around the valley pan gasket so I decided to replace that as well since the carb was coming off and of course since I am pulling the carb off, why not paint and clean the intake manifold and get everything nice and clean before it's put it back together.
So my questions below are based on the pictures that I have included in this link: https://photos.app.goo.gl/WJhxmrTSjarwYWr5A
1. Is there any way to identify this engine as a 389 or 400 from the pictures?
2. Based on the exposed engine, how does everything look to you? I am a novice so everything looks really clean to me. I was told the engine was re-built about 8000 miles back so this possibly makes sense.
3. Does the one rod (Cylinder #1
I believe) that is a different color mean anything and should I do anything about it?
4. Any suggestions of other work I should be doing while the engines apart? I am not looking to spend more $$$ than I already have to but I figure it would be good to make changes if this is a good time to do so.
They are going to re-paint and clean everything as well as re-route and replace most of the old wiring to make things look nicer when done.
Fingers crossed all goes well