i would look in to going mass air use the hole stock set up in the van . your old throttle body k code or others just plane will not work with much of any cam no trade off just plane will not work with map like i said manny time s to you I seen it done it will not work with your old set up .but the mass air can work its stock gm and a re chip it should work fine should be many in the bone yard why wast money on some thing that gm has made and works ? if the mass air set up can talk to all part in line it will not know what car/truck its in i seen this done many times with motercycle engines like the gxr in road race cars . air boats . i have seen computer engines put back to carb and dist like the quad four and echo teck by driving a older dist out of a older 4 engine reworking it and drive it off the end of the cam