I purchased JWT fuel rail adapter kit for new injectors. I did have to grind plenum (not difficult). Adapters didn't seem to seat properly. I took my time installing them, lubing orings, etc. Anywho, Orings in #1 and #5 cylinders blew. I hydro locked engine, bent rods and all. Complete rebuild. I purchased AMS fuel rail with SS fuel lines. Mechanic said it was a work of art. Everything fit perfectly. I understand the whole 300 degree/ AMS thing, but moral issues aside, I was very pleased with quality and price. Just my 2cents