273 intake vs. Edelbrock 1406 carb

Sometimes you need a adapter. For one reason or another sometimes it's just clearance. But you definitely need the correct kickdown linkage adapter. The two barrel had a different throw on the kickdown linkage. There's some stuff you'll have to do there to make things correct.
Nice when you formally introduce yourself with a picture of your car and such and it makes people want to help more as you probably know from reading the forum...
Welcome..