Check out www.lceperformance.com

They don't advertise for Van specific stuff, but they have correct CC drop in injectors. I ran a set of their matched 22RE injectors (same CC as the Van) for several years. You'll want to research the correct CC and plug and call them. They have great customer service.

I'm currently running Bosch 4 hole high impedance injectors from an eBay company called osidetiger. I ran them using the stock computer, now I have standalone injection. You can run the high impedance on the stock computer by deleting the injector resister.

Keeping these vans running means finding creative solutions. Sometimes you get lucky and end up upgrading at the same time.