My 1972 Suburban has a Cadillac 500 V8

Just picked up a new car last weekend. The guy told me it was a 1972 Suburban with a rebuilt 350 V8. When I got down there I opened the hood and instantly knew it wasn't a 350. I've owned 2 different Cadillac big block cars in my life...a 1968 Fleetwood limousine with a 472 and a 1970 Coupe De Ville also with a 472. I found the receipts for the engine rebuild which was done in 2003. Right on the top line it says "rebuild Cadillac 500". The engine looks brand new. He claimed it probably has less than 10k miles since rebuild. It has an Accel HEI and Edlebrock aluminum intake. All I can tell you is I'm 28 years old, owned 15 fast cars and this beast of a truck scared me it is so fast. I'll post some pics later if anyone cares to see it. The truck is really cool, it's an old Huntington Beach cruiser, Aqua blue dropped on torque thrusts. I'm going to put some money into it and get the rest of the truck as clean as the drivetrain.