Had a dual snorkel with a TM-6 and 750 double with 2 NOS plates on my 69 fish in the day. Had to use a Moroso drop filter but it fit under. Snorkel was bling only and added nothing to the height allowance.
Still have the TM-6 and eddy 800 AVS with factory unsilenced cleaner. It fits just fine.
If it matters the 383 k-frame is the factory stocker BB unit with factory mounts. The non stock K and non stock mounts might sit higher!