[b454rat]

Not 100% but it there is an oil port over the timing cover, it's possible a 4 bolt. Where I am there are roundy-rounder tracks within an hour from each other. Friend used to build engines for many of them, and lived next door to another buddy's junkyard. He had it for over 20 years, and had all kinds of stuff come in. But would always look for that plug for hopes of a 4 bolt. But like others said, not really a big deal. In fact, of all the motors I built over the last 20 years, can only remember one being a 4 bolt. Big blocks and small. One was a pretty nasty 468, 2 bolt block....