It was a stone stock 401 with a comp series AFB, ST400 (TH400) a 16 1/2" long drive shaft to a 3.08 non posi 67 Camaro 12 bolt.
It wasn't very fast but it was quick. It only ran a 14.62 at 95 mph best in the quarter but at an 1/8 mile I was always ahead of even much faster cars. It hooked up with zero wheel spin, it really launched.
When the box was all done there was no way anyone would think there was a motor in it. The carb sat between the seats that were mounted over the valve covers. The front of the box ended down at the floor so the firewall was actually flat. You could sit on the box with your feet down the front of the box if you liked. Now understand the carb was right under the lid of this sheetmetal box. It's air cleaner was one of those Edelbrock triangular shaped ones with the foam on top. So when the carb was opened up it was sucking on the top lid of the box. Picture this, looking into the mirror you are looking right into the face of anyone sitting in the middle. The box had no padding, it was just vinyl covered metal. If I had a woman sitting in the middle and I stabbed the throttle to the floor the secondaries opened and were really sucking down on that lid, I will never forget the look on the ladies faces.
I had an old friend of mine and his girl friend in the truck once, her eyes lit up as big a saucers and she said to him "I want one of these". LOL
The photo of it with no bed and the radiator hanging out there was how I drove it for a little bit, it turned heads that is for sure. But even all done I would go to a show and people would walk by not giving a crap for this truck with all the cool rods and casually looking into the engine compartment and when they didn't see anything they would change direction so they were walking a little closer, then closer then closer until they were staring down at the axle and no motor. Then yelling at their friends who had continued walking past to come take a look.
I had an Edelbrock remote thermostat housing for running a blower. I removed the water manifold and made up flanges to bolt to the ends of the heads where heater hoses hooked to and ran the water down to the thermostat housing bolted on the frame. The oil pan was about six inches off the ground and had a few scraps from hitting speed bumps. I made an enlarged sump so I could thin it up a little but it still was hanging as low as the tranny pan so what the heck. This was all done before I was 20 years old, well everything except the upholstery, that didn't get done until a few years later. I actually drove it a lot without any door glass, pouring rain, no door glass and vacuum wipers.