As far as I KNOW, no one has done a "vortec" swap. Dons and Karys are CPI. Think of that as vortec Beta.

I have done a few 96 and up vortec motors, and they are pretty complicated on the wiring front. The ECUs had to be sent to Edelbrock FAST offices to be reprogrammed to eliminate the VATS, and a few other things.

Now. That being said there are benefits. Fuel mileage, torque.. blahbalh.

I think bob shaw(or a friend) was going this route, but decided against it due to the more complicated wiring, and the integral cast aluminum oil pan. Those are 2 things he usually posts up when someone asks about vortec swaps, and they arent that difficult to overcome.

Myself.. I have TBI.. I like it for the simplicity, ease of installation(hey not THAT easy now!!) Great running, and awesome off camber performance. If I had my choice... I think a 96 5.7 vortec motor would be my ultimate motor for my raider.
I have done about 15 TBI motor swaps (305 4.3, and 350's) 3 Vortec Swaps (5.7, and 4.3's) 1 Holley EFI to GM TBI swap, a carb Swap (HeeeeHAW) (though I have not done a CPI swap) Lt1, tuned port, There are more, but I can't remember... I should have written all these down. Anyways.. my point is this. The vortec trucks were Always excelent performers, and super solidly reliable.. Same thing with the TBI trucks. Just a little less power, but EVERYONE likes their motors swaps TBI, CPI, Vortec. No one is going to look at a TBI 4.3, that looks stock in your raider, and scoff at you... I promise. <img src="/forums/images/graemlins/smile.gif" alt="" /> Good Luck, and keep us posted on whatever you decide. <img src="/forums/images/graemlins/kewl.gif" alt="" />