I would perform a simple engine health test before ripping into it.
Do a compression test
check the oil pressures, cold and fully warmed up.
Check engine vacuum at Idle .
Check the crankshaft end play to be sure nothing going on there.
You may want to degree the cam to determine what it is also.
Be sure to read up on how to do the tests. Crankshaft Coalition would be a good place to explore for a tutorial.
I would opt for a stroker if you need to rebuild it, just dont forget what i said about the compression ratio, as when stroking it, you will increase the cylinder volume and that will raise the CR higher.
Fact is stranger than Fiction