Unless you want an ABSOLUTELY ORIGINAL SHOW WINNER CARB on your car, I'd follow CTH's advice. If you need a new carb, all I've heard of about Solexes are how people hate them - opposed to the Zenith lovers around here. And since no 280S will ever be a show winner... well...

You want the best power and economy, that you can easily tune and find parts for right? Not something that is nearly impossible to get any parts for. Who's telling you you need a new carb - a mechanic, or you tried rebuilding it and found it to be unrepairable?

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k