From very faded memory is it distributor side about three inches higher than the sump on the lower side of the block near the engine mount. If the engine has been re built at anytime the numbers may have been removed.
Em
I pored over this area very thoroughly and saw nothing in the form of
a metal stamping or of a suitable surface to apply one. I have owned the car since Nov.'70,....It has a T3 block casting.