They have been opened up ~.125" (1/8) in width which is OK for most heads other than E7 or some early Gt40 (not P) heads. For the vast majority of heads out there, the width is not a problem.
They were between 1 1/16-1 1/8 depending on where exactly I measured (not perfect) so probably not even that much it sounds like. I don't know what I'm going to do for heads, but now knowing they are on the smaller side widthwise -- what do you think about throwing it on with stock or GT40 heads?
I'm kind of glad it's mostly polishing inside -- I'd rather have it that way anyway.
Thanks for the help everyone -- it's much appreciated.