The area I live in is surrounded by highway safety corridors and constant construction because they never fix the road right. They only band-aid it. To get to real highway driving, I'd have to go about 20 miles in either direction. That only happens around the holidays when I go on vacation. My 48 is used semi-daily about 8 months a year and I've had no stopping or steering issues with it at all. In fact, it stops and steers better than my 50's cars.
Just the other day, I had my 75 tbird on the highway and no one was going over 60. Still, the choice is yours.

In experimenting on the other 2 vehicles with the same idle issues, I've found leaning back the mixture .25 to .5 turn on both screws has improved them so I'll try it on the 48 as well. I'm attributing this to the fuel as none of them did this until the last fill-up. 3 weeks ago our last local station switched to the ethanol blended fuel.

Nah, they're "speed holes"
I'd just seal them up with some epoxy and electrical "knock-out" plugs.

Perhaps that could be our new slogan

Welcome aboard. I own and drive a 22nd with a 288. It is capable of freeway speeds. I've had it at 60mph with no trouble and could probably go faster, just haven't tried yet. It doesn't like high winds though.
While I don't care for the "Lambo" doors mod on the ebay car, I do like the hood opening mod on it.

That's a nice one!

Mine arrived yesterday. It was written well and will do much for promotion of the brand in general.

And keep it is what I hope to do. After a serious comparison of both cars considered. The 48 wins in almost every category except parts availability and gadgets. The 73 buick will go first. That's my mother's car, I'll put her in the 78 Ltd. The 75 Thunderbird (6 and 11 mpg) will go when I absolutely have to dump one. I'm going to modify the 59 Galaxie for my daily commute.
Back to the 48. On really humid days, I'm developing a slight miss at idle speed. 3 different cars here did it on the same day. Could this be from the new fuel blends? Possible carb adjustment...

That looks just like the one I've been using. The only problem with it is the handle metal is a bit soft. Now I only tap the handle until tight and hit the drum instead. It's a little slower that way.

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I've been learning this as well. I've got quite a few from many eras and most don't seem to have the build quality of my 48 or my father's 41 stude. From my experience so far, Ford quality really went bad around 1957, GM around 55 or 65 depending on point of view. To me, I'd say 65. Especially the frames. What I may do is sell all the 70's cars and the extra parts and just run my 60's and older. What I've been thinking of doing is sell the 48 and then, after all the estate crap I've been dealing with across multiple states is finally over, find a real nice 48-50 tub. Thing is, "bird in hand" is usually best bet. These are just ideas...

For now, there's just too many here. 75 tbird, 78 ltd, 73 buick, 66 chrysler, 62 buick, 59 edsel, 59 galaxie, 48 packard, 41 studebaker
A lot of them use parts in common, but it's still never easy.