Need help NON mopar 1967 Pontiac Lemans 326

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Got the distributor clocked correctly. Double checked tdc. Set the initial to 16. Same results.

Buddy has a torch. Hooked up a rubber hose and ran oxygen under intake. No leaks.

Ran it along the carb and it picked up in the rear.

Pulled the carb off and noticed the bolts weren’t all that tight. (Stainless hardware)

The rear plug was sealed with liquid Teflon.

Sprayed some glass cleaner on the plug and hit the port with some air. Couldn’t get it to bubble
Took the plug out and used some natural gas pipe tape.

Replaced the stainless studs with new ones that came with the 3/8 carb base gasket kit.
Only found 3 fine thread nuts so one of them got a bolt.

Fired it back up and double checked it with the oxygen again. Good to go.

Didn’t pop and bang. Seemed to idle a little higher.

Probably back off the initial a little and tune the carb when I get some more free time.

Thanks for all the comments/help.