Hi Kurt,firstly welcome from a fellow '50 owner which,coincidentally came from Ca. but is a long way from home now.

It sounds like you're on the right track re; the whistling,but try posting this same question in the engine sub-forum,not all the engine gurus check in here.
I'm sure you'll get a better response and help to cure your problem.
Good luck.
Jock.



1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.