Back in the day the #163 intake was a popular choice since there weren't a lot of oval port options....and the Chevy unit was cheap and readily available. I can't speak to the science...but I know lots of guys who ran them and they seemed to work just fine.
Here is an old SYC thread..
https://www.yenko.net/ubbthreads/ubbt...opics/193427/1
There are similar stories on the other sites...believe it or not...it works.
wilma