64 Valiant 426 ss on craigs list???

When your standing in front of it on your right on top of the block in front
Of the valley pan that 1 1/4" x 2" flat pad has the cubic inch displacement stamped on it along with other info like the year and some stamping
On undersized bearings and such there is a good chance that could be a 426
If so it will have 426 stamped on the I'd pad as for the heads you would need to pull the valve cover to get the numbers and there is an I'd pad on a b series engine it is located on the block on the same plane as the head surface just above the water jacket outlets where the water pump attaches that pad would right below the distributor hole