Another cheap and easy upgrade, (if your van doesn't have one stock) is a cold air intake tube hooked up to the snorkel on the stock air cleaner.
Another useful stock part, if it would fit, is a dual snorkel air cleaner. This may, or may not work for a carbed motor in a cold climate.
On my EFI '88 318, I blocked off and plugged vacuum to the air cleaner. This closes off the thermostatic warm air valve, fully opens up the main snorkel, and, Bonus! the "power" snorkel. No ill effects from losing the stovepipe. Tested. Instant cold starts down to 2 degrees.
Also, a '94 snorkel intake fits into the core support, and over the stock '88 main snorkel tube. The power snorkel is next for a CAI tube fab. Crap in the way, but it's fine for Winter.
Good Wrenching!