Nope!
no
350 heads will bolt to the 400 block. They will need to be drilled for the "steam ports" in the 400 block.
Into the heads only.
Yes the heads will, But the problem is that the vortec intake won't bolt up to the pre- 90 heads. DIFFERENT BOLT PATTERN.
The heads will fit the block, but the vortec intake manifold will not bolt to the old style heads.
The deck is the surface to which you bolt the cylinder heads to.
YES. The heads will bolt right on.
5x4.25 like the mustang
To receive a correct answer more information will be needed: (mounting bolt for ???).
yes they will bolt right on.
It should bolt up without changing the heads.
3/8" if 9/16 socket heads.