Edelbrock Performer Heads

I don't know how much can be removed, but I bolted a set of 340 manifolds to the Eddys on my 340. Found the driver's side down pipe hit the head, so I ground the head until it cleared. Didn't hit water. Have headers on the car now, but the ground-on head is still the same and has not leaked in the couple of decades I've run it since I ground on it.

I probably would not have had the nerve to grind on the head if I had had access to forum discussions of the issue, but sometimes one survives being ignorant.