Look at that massive air hole on that genny ( perhaps the cobra?). One single, 1 mm or less was it .I remember going from 32 and 30 to 28g and drilling out a genny to over 1mm and thinking ,much too airy and just ruined my tank....
I drilled out most of my early MTL atty's for DLH (way too many of them to list, but remember even $150-$285 atty's that were drilled). Some of the single coil atty's that allowed a center/high coil build even got dual air holes. If you could drive a 1956 Edsel thru the drilled hole it had big enough air for my DLH's.