I’m sure there is more than just “some suspension work”. I’ll bet if you went to talk to the guy you’d see it’s been extremely modified. I’ve seen at least 10 of these cars over the years on Craig’s List, eBay, etc. They were primarily Drag Race oriented cars that give up ride and handling to go fast in a straight line.
To fit a V8 drivetrain, the firewall, floor, frame and rear suspension need to be HEAVILY modified requiring much special fabrication. You’d also be well served with a roll cage, fuel cell, racing seats and harnesses, not to mention larger brakes all around and a larger rear end too. Good luck if this is your plan…it’s not an easy job.