Rickster, The fuel line connections you stated are WRONG! The top fuel line fitting is always the return! Just remember this... air bubbles alway float up, so the top fitting will always be the return bleed to purge air bubbles and pressure drop after engine is shut down.
Yes, Boswell's were Hi tech in the day, but as he got crazier with his mods they didn't work as well, I did learn to make them work, but I had to take away some of what he did to them, I have some of his technology that I applied to some of my freestyle carb set-ups. Any of you guys that I have set-up motors for, have felt this technology!