66 Conv. 289 to 351

[zach0]

Ok, I am getting near finally and I know I can put a 302 in place of the 289 but what would it take to put the 351W in their. I know the 351 has width of 1 1/4 inches wider on each side. Am I going to have a problem finding headers to fit in their or what. This is my first conversion and I understand the motor mounts and the C-4 will mount with no problems if I heard right. Any help would be much appreciated.

351W or 351C which would be better.