See, that's the nice thing about the Magnums, you can adapt the factory EFI. With a slant, the best you can do is some aftermarket stuff (MegaSquirt, FAST, etc.). Sure, some have adapted the Buick EFI, but I wouldn't trust that for anything much above stock.
I wish the concept slant with a draw thru turbo had been been produced (along with the Fast-Burn Aluminum head too...) Even though it was only a draw through, retaining the BBD, of all things, that would have given us a leg up, along with 30+ years to better a factory setup. Then, just *maybe* we'd have half of what the turbo Buick folks have lol