i seen a few things in the search but they lean to the 351w and i think this set of heads are 302 because of the smaller head bolt size. long and short are they worth messing with or are they just a plain old set of 1970 heads? they have what looked to be a CP stamped under the valve cover but no sign yet of a cubic inch like my other sets of sbf heads have. (it was dark and they are dirty so maybe i missed it)