I know this has been discussed here several times, and I asked the same question myself awhile back. I had one response to my thread from a member, and my apologies I do not remember who, but he told me he was running the GT40P heads on his 351W and using the Ultraflow headers from JBG and Taylor Plug wires with a 135 degree boot, and had run this set up with no issues for a couple of years.