Besides, the Offy manifold is aluminum and looks better. Hilborn had a fuel injection setup of these things, at least I think it was Hilborn. I remember seeing a trick dragster with a late 50's old, port fuel injection, and stock velocity stacks for each intake. There were blower intakes for these guys as well. A letter indicates a big block, a number indicates a small block.
Big blocks have a little hump in that area, whereas the small blocks are flat the whole way across.
1st year, big cars. Toro is different internally. However, since engine color may have been changed, use this as supporting evidence only. These are commonly 1967 to 1970 or so 425 or 455 blocks. Also, different combinations of lifter diameter and that cam bank angle were used.