COBRABRAT2

I have a set of World Windsor Sr. heads for a 351W in a 91GT Mustang. These have angled spark plug inlets for central chamber spark, I suppose like the GT40P heads. I can get a spark plug in the hole with a socket, which, I believe is a problem the GT40 heads had, so I'm not worried about that BUT....will I have header problems anyway? These World heads also have Two header bolt holes on each side of the exhaust ports. Does anyone know if these are a problem and what header works the best? I am hoping to use long tube 1-3/4" headers.

any info would be much appreciated.