1973 C20 Cheyenne Super 454

[RPOZ11]

Update
Been driving it every day since the install of the vent line.
No issues; 2 weeks going.
However I did run into a knock issue within the engine just after I got off the freeway.
Going to look into timing.
I spent about an hour with a car builder today.
I am considering installing the MSD Atomic Fuel injection unit.
Their recommendations seem to suggest that this will cure alot of daily driving issues, start up, and customizing the fuel delivery.
They did state that the MSD brain self learns.
This may positively affect my timing issue / engine knock as well.
Its pricey upgrade but one that may provide improved results.