First let me say you made a good choice of years. The 69's did come with a 351W so this could be the original engine. I would recommend looking at the data plate on the door to find out what options your car came with originally.
You say it dies around 100 MPH, when you say this is the engine reving high or does it sound like it has more?
When you say overheat, when does it do this? In traffic or going down the highway?
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69 351W Sportsroof deluxe
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