I spoke with the owner's father. The son knows little about cars and inherited the GSX from an uncle who passed away. I don't remember now for sure, but I think it is non-original engine and was originally non-Stage 1 but the replacement was built to Stage 1 specs. The car is nice, but the stripes were not accurately reproduced and a few small corrections in the engine compartment would be needed to return the car to original. I have some additional photos that the father sent me if anyone is interested in seeing them.