US Wheel has these in their 2020 catalog, and Summit carries them for around $250 each. They are 10lbs heavier than 15" wheels, or 17" aluminum Magnum 500. Would the extra 40lbs of unsprung weight, and rotational mass negate any benefit of being able to use better tires? It looks like they are using a 15" rim in the posted pictures, so who knows what a 17" wheel with a hub cap and tire look like? I see aluminum versions for $800 to $1900 each. I'm not willing to pay that much for any wheel, but $250 looks attractive.
https://www.uswheel.com/wheel/7677/us-wheel-chrysler-oe-series-658/?finishID=12#specs
https://www.summitracing.com/search/department/wheels-tires/part-type/wheels/wheel-diameter/17-in/wheel-bolt-pattern-app/5-x-4-1-2-in/wheel-material/steel/brand/u-s-wheel?SortBy=Default&SortOrder=Ascending&N=department%3Awheels-tires%2Bpart-type%3Awheels%2Bwheel-diameter%3A17-in%2Bwheel-bolt-pattern-app%3A5-x-4-1-2-in%2Bwheel-material%3Asteel%2Bbrand%3Au-s-wheel%2Bmanufacturers-wheel-series%3Au-s-wheel-658-series-oem-wheels
You'll save a couple pounds on the 17" tires compared to the 15's but 40 lbs is a heavy wheel. But these aren't exactly light cars. So rather than adding 40 lbs you'll add 20-25 pounds compared to 15's with 255-295's. If your trying to save weight and racing its probably not the best choice but if its just for cruising I'd think you'd be fine.
Here's a 68 on 17's with the caps. Doubt they are the same as the US wheels but gives you an idea of the look.
https://www.mecum.com/lots/FL0116-230648/1968-dodge-charger-rt-resto-mod/
Ring Brothers also did one but I think those were 20's and aluminum? My only gripe on that one is the caps stick out too far on the fronts.