How difficult is it to transplant a Chevy 350 (5.7L) V8 into a 5th generation El Camino?

I am looking at a 1987 Chevy El Camino. It's a solid vehicle, and pretty cheap, but it's main drawback is that it only has the 4.3L V6. I know that the 5th generation (1978-87) El Camino's came with the 350ci (5.7L) V8, but I'm just wondering if the V6 models have the same facilities to allow the V8 to practically drop right in, or whether the V6 model would need some modification to allow the 350 V8 to fit in.