Many weeks ago i started the winter breakdown of my 350 SS to add some "correct parts". Thought the heads could use a freshening up, off to the machine they went(3947041)Well i got the call, one head has a nasty crack. I started a search and could not come up with a single or a matching set.my question to all is, my cast date for my engine is oct 21 68, my engine build date is oct 24 68, original heads dated oct 3 and 9 68. Would a set of heads dated in late septemeber be possibly "correct" for my car?