Jim,
Really good write-up. /\ /\ /\ /\
Also, it sounds like you're running your engine really hard! Much, much harder than drag racing!
The reason I'm using the drilled 1/4" NPT plug, that is what Dart and several other people recommended to me for my engine. Also, everyone recommended a .125" to .150" hole in the restrictors. Additionally, I'm not sure my Little-M block can use those long restrictors with the O-ring.
Warren
Here are some photos.
http://gi77.photobucket.com/groups/j...g?t=1259886325
http://gi77.photobucket.com/groups/j...g?t=1259886666