Found my dads original 1971 duster!

Why is this shop.asking you when they are supposed to be mopar experts? And why did engine shop slap a square bore carb on a spread bore intake vs getting correct carb or getting compatible intake? They prob talking about throttle adapter which any shop who has ever work on old mopars should know:

Edelbrock 1481 Edelbrock Throttle Lever Adapters for Performer Carburetors | Summit Racing
I agree. I’m not sure how he can’t know how to do it. Makes no sense to me. Yes, I believe it’s a throttle adapter. I’m sure the engine builder would have used the proper carb. I’ll have a look at that link. Thanks