I concur with the gentlemen from NY and FL. No reason to upgrade the 109 to BA unless it will become a primary of primaries- especially if it's already hooked up to a balanced first stage.
The lever in your picture should be compatible with the duro poppet. However as RH mentioned, it might be in need of adjustment. On that other board we discussed a similar issue where I posted pictures of Herman's lever height tool, correct lever height, etc. See this link:
https://www.scubaboard.com/community/th ... st-7877254
If it turns out your lever needs adjusting, let me know. For the price of shipping I can send you one I've already adjusted or sell you a fancy one.
Edit: It might just be my cheap monitor's resolution, but the orifice in the picture looks a bit rough. While there are ways of dressing it up, why not spend a few of the bucks you saved and purchase a new orifice now offered by Bryan?
http://vintagedoublehose.com/store/#!/S ... p/75284295
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