72 Blazer K5: Is is possible to remove distributor with engine in truck?

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Hello Folks,

I have a 1972 Blazer K5 4x4 with a stock 350 engine setup, I tested the vacuum advance unit on my distributor today and found it to be non functional, not holding any vacuum, the diafram inside is probably toast.

I'd like to proceed to replace the vacuum advance unit and my thought was to pull the distributor out to make sure I don't drop small screws down into the works, as I'm swapping in the new unit, but wanted to ask, if there is room on the 4x4 Blazer to lift the distributor out while the engine is in the truck? (seems pretty tight up against the firewall) Or do I have to swap the vacuum canister with the distributor in place in the engine?

Thanks!

-Ian