Wow, just flipping WOW!!!!!!
What's the exhaust setup going to consist of? What are the plans for the ride(drag/road course/DD?) Also, what shop do you work at again???
I may or may not have just wet myself a little bit...
The old 260, 289, 302 and 351 shared a common block size, the bore and stroke changed. Different parts will change outer dimensions a bit - oil pans, heads, manifolds, etc,,.