I've got a performance tip for a 2.4L 3spd van.
Drop TII rods and 2.5L Mahle STOCK pistons in it. Shave the head and block some(get comp. ration to about 7.5:1). Remove the balance shafts. Bolt a mexi-manifold and a t3/4 (properly matched) on the back. Put your choice of an intercooler on it. Build the tranny, fill the mounts, and run your choice of engine management. Run a distributor and SMEC from a turbododge, or FMU and injectors, or pigybacks, or standalone. Lighten the hell out of it, tint the windows, and get real firm shocks or airbags for the rear.
If I win the lottery I'm doing this with a regular (not Grand) Caravan just for fun. They are shorter and weigh less I believe.
And why the hell is there a Caravan forum???