As I understand it, the "lope" is caused by valve overlap, which is not necessarily a good thing.
I think people equate the "lope" with race car engines, so they think that's how the idle is suppose to sound. In reality, those engines are designed to run at extremely high RPMs, and their long duration cams causes rough, inconsistent, and inefficient idle quality.
It sounds like your 38 is tuned better for your engine than the 2100 was. I love the Weber 38 for a 258.
Now I lay me down to sleep.
I pray the Lord to fix my Jeep.
If I should die before I wake
Roll this POS into a lake!