HOLLEY SNIPER FUEL INJECTION ~or~ CARBURETOR???

I'll probably order everything to go Sniper EFI this winter based on my friend who has installed 6 or 7 of these with no issues. I think you'll find probably 95% of issues are from installation error or not following the directions. I think the best advice I've found is install what your used to and comfortable tuning. As per your purchase, did the seller give you any reason they sold it?