Unless you go with a pretty big single turbo you'll need a dual setup. Your biggest concern on a v-8 the exhaust housing for starters. You'll need to size a single for 5 liters, or if you go dual it's more like sizing for 2 2.5 liter 4 cylinders. If you're looking for cheap, you can get some chinese turbos off of ebay to play with for under $200 each. It's a lot better to buy some cheap chinese turbos than buying somthing from a friend that's just sized totally wrong. But any way you go about it it's not going to be cheap...........

for duals get these

for a single get this one

If you're serious I've allways wanted to twin turbo a v-8