bought this to fix fuel drain back problem

I wish you luck, but I'd bet this won't help. I know I've said this before, but the three biggest things that helped vapor lock/ hot starts and so on for the 67 was

A rear mount, electric pump. I got a good deal on a Holley Red locally, so that's what I used

Installed a carb heat isolator. Believe it or not, our local O'Reallys had them

Built a vapor return system with Wix 33040/ 41 filter which has a built in orifice




Damn.... I have been trying to fing the part# for one of those for a while...
I need another for my 6-pack 70 Charger and another to install on my 68 fastback.

You sir are a wealth of info !