Yeah, I saw that HPI Guy had similar issues in his build video, supposedly they are correcting the problems for the second run. Anyway, yours looks very good despite your trouble!
The sedan delivery had mags that were very similar to Pontiac Rally II wheels. The ones on the box art shown for the new kit are from the '39 Coupe, so they must have switched them into the delivery kit.
FWIW, I have used the 3×2 intake from the AMT '58 Impala on small block engines and it works with minimal modification. It looks pretty close too. I used carbs from a Revell parts pack.
I could help you with the Corvette valve covers and intake, but I will not be able to get to my model parts until closer to the end of August. I am guessing you want to have the car done by then.
It's looking really good! I like the wide whites and steel wheels a lot! The 5 spokes look good too. I guess it just depends on what era you are going for, the wide whites are more late 50's/early 60's and the 5 spokes would be more mid to late 60's or later. I like either choice better than the chrome reversed ones you had on it earlier. Did you get your Corvette valve covers and 3x2 intake?
I always liked both of these. Probably my favorites of your builds, along with your yellow Monogram '30 Woody. The red/brown primer one reminds me of Robert Williams roadster before he ruined it with that goofy yellow and purple paint job it has now....
I am perfectly fine with people making stupid decisions when it only affects them, but there were innocent people involved here and they don't really seem to be too bothered by that. I should think that there is a hefty lawsuit here and the owner of the Mercury has no leg to stand on.