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That is funny, I was moving a truck around at work last Friday that had the same seats, I was sitting there wondering how hard it would be to get it to fit into my 74.
Someone advised me to take a good look at the seat support if you use integrated seat belts. If you don't beef up the floor where the seat is bolted down, they could pull loose in an accident. I don't think it takes anything huge, crawl under there and look at what GM used for the seatbelts. I put about 3X3 squares of 1/8 inch steel under mine. Something to consider..... you're going to run into the heat shield for the catalytic converter on the driver's side and the fuel tank on the passenger side.
Depending on how high they site with the floor hump, you may need to modify the floor. These seats fit great in Blazers with flat floors. The are going to be too high for a pick up from my experience.