I recommend picking up Jerry's book ,reads like a reference manual. I love it ,using it to document my car. Get the important #s out of it : block, heads, trans ,rear end, date codes. Like an algorithm : numbers don't match---stop, if they do proceed .
If your seller is charging what it's worth ,it is clean and appears legit ,see about splitting the cost on getting it certified. If mine was on the chopping block ,I'd agree to it.
Cars not sitting in a PA Amish barn , right?