Smoothing firewall question

[Josh@Ridetech]

Another rookie with firewall smoothing questions (70 Firebird, Pontiac powered, T56). Not interested in perfectly smoothed, but want to clean it up and eliminate any unnecessary holes. Car will have vintage air (I'll use the kit's suggested pass through location), AAW kit, GPS speedo, welded in DSE brake and clutch MC bracket, factory pedals, factory wiper.

Should I leave open any of the holes labeled A-G?
Are H & I for the hard plastic carpet guard, and if so, do folks use that in these cars?
Any reason not to eliminate the speedo pass through (?1)?
Any reason to keep the flexible clip (?2, I'm assuming there are more attractive solutions)?
Anything else I should think about?

Perfect time for this question as I just did this exact thing a few weeks ago.

A-F: I filled in all of those. They were just used as mounting locations for wire loom clips and other small factory pieces that aren't going back on the car.
G: I left just in case I needed to route something through the firewall. I figured at some point I'll probably need a hole down there to bring some wiring though.
H-I: I plan on using the plastic guard so I left these. I didn't like the holes but there wasn't much of an option to mount it any other way. I'm sure some guys don't use it, it's just preference though!
1: With that one being as low as it is and will be hidden for the most part, I left that one and plan to put a body plug in it.
2: That flexible clip deal was one of the first things to go on mine. Cut one spot weld and that ugly piece was on the floor.



I also filled in that small square hole below the wiper motor. It was the mount for the choke cable.