it's not top swapped, I had a north star throttle body on and took it off without realizing the only throttle body I had on hand was an L36. the L36 worked fine, and then when I switched to the L67, the maf smoothing hasn't gone as expected.

the other thing I changed was the L67 tb didn't have the honey comb installed, so I took it out of the L36 and put it in the L67 tb. I made one adjustment after that, and it seems more accurate now.