Not sure on the fastback part but the H in the vin would indicate a 2v 351, either Winsor or Cleveland variant and judging from the engine pic that sure isn't a Cleveland in there. I would have to pause and carefully consider what's going on here, take that vin info to the DMV and see what they say about the car.
that 429 looks like it might be a factory install, and if so, would make that a rare car. the vin says 351-2V. I would look for other VIN's in the other locations. there should be a buck tag (I think) somewhere under the hood.