I had my EGR cooler/Engine Oil Cooler, head gaskets and had ARP studs installed in my 05 250 diesel 6.0 by Apple Ford in Columbia and they did a great job. They ARE a Ford dealer and they did have a good diesel tech but you pay for it! I'd get a quote/time from them and maybe a Ford dealer near you. No one understands these 6.0's like the Ford people themselves.

Be very careful about an independent mech.... they might be really good gas engine tech, but the 6.0 is a different breed.