The valve stem seals that were installed 50 years ago when the engine was rebuilt for some reason weren't doing their job so it was time to replace the.
I decided that this was as good of time as any to upgrade the intake manifold and went with the Edelbrock Performer.
Back in the day this is what I did for a living and today I really don't miss doing it. ;)
That old cast iron FE 4-V intake must weigh 500 lbs. :E :R :W
It turned out great. No more puffs of smoke on decel and literally zero oil consumption.
Improved performance all across the board, especially when you first shift into the next higher gear just driving normal.
Now I'm thinking I need to get a bigger carburetor, like a 750 cfm. :B