84 - 85 vans have vacuum advance (distributor uses a vacuum diaphragm to actuate timing advance manually). 86 - 89 vans have electronic advance (ECU advances timing based on input from the throttle position sensor). The distributor in your link will physically fit, but you would need make some other major changes to the wiring and replace your ECU and igniter before it would function correctly. If your original distributor is actually bad, and you can't find a new one, then your best bet is to find a used one in a salvage yard or use one of the salvage yard search sites. Sometimes you'll find good used ones on eBay. Good luck! Tim

PS: Looks like there's a Chinese reproduction on eBay for $80 (+ $35 shipping), but no telling what quality/longevity you could expect:

https://www.ebay.com/itm/FIT-CAD-Qua...Zsca#vi-ilComp

FYI, the original Toyota part number for a 1985 van's distributor is #19030-73020. This one is listed under #19030-73040, but lists the number you want in the description as interchangeable. Personally I'd be a bit concerned using a Chinese reproduction for a critical part like this.