I used 3 TWM 45mm DCOE pattern on the 265 Hemi in my UC hatch with Haltech ECU.
The 45mm throttle bodies flow better than 48mm webers no internal restrictions with throttle bodies
I don't like the look of those old school ones you posted i wouldn't buy them
The biggest advantage with injection over weber carbies is you don't have to remove them then pull them all apart just to make some changes it's all done by pressing buttons on a laptop don't get your hands dirty a lot less work in setting up and maintaining them.
Chrysler owners manual suggested using hotter plugs to prevent fouling for prolonged slow driving and said these hotter plugs must not be used for high speed driving to avoid detonation i was able to run colder plugs never had any problems.
I had a 600 Holley with vac secondary, triple 45mm dcoe and finally injection which worked the best under all conditions with any old classic i would always convert to injection it works much better.
Before i put cold air box on air temps would rise while stopped at idle for a while causing it to ping a little when taking off the air temp correction maps allowed me to pull about 3 deg of advance out which stopped pinging then went back to full advance when air temp dropped. It also had fuel correction map so you could run it a little richer when coolant temp increased.
Part throttle cruise had huge gains i cranked it up to around 38 deg advance at 2-3% throttle opening it purred like a kitten it was docile like a modern car in peak hour traffic. I could cruise around at speed limits using less than 5% throttle fuel economy was excellent fuel cut on deceleration cut fuel to injectors when lifting off and coasting it cut back in around 1200 rpm.
No choke to worry about with cold starts you can program enrichment by coolant temp started very quickly as injectors squirt fuel when cranking.
If you go injection control ignition timing with ECU as well i used a Lumenition optical pickup welded mech advance up dizzy had to be locked as ECU controls it had MSD 6 on it.
Fuel delivery needs lines capable of higher pressure high pressure capable fuel filter i would put swirl pot in tank fed by low pressure pump from tank with high pressure pump supplying injectors. Not a huge drama used Earls Stat o seal for return line so no welding needed for that fitting.
Also helps with theft prevention if car is left for a while then change fuel and ignition maps to something that doesn't supply fuel or spark so it can't start fuel pump switches can also help with this. If you have kids or lend it you can load another map that doesn't work if they use more than 20% Throttle opening.
Nothing to be afraid of with injection when you figure it out you will find it's much easier than fiddling with carbies.