Is this a good idea?

Let me add, I had a stock 74 360 Dart Sport, it was a 4sp. car, It ran pretty good, But i installed a 75 400 in a 72 Duster, it was out of a Newport, This engine was bone stock, right down to the stock 2 barrel & Exhaust manifolds, it even had single exhaust LOL, stock rearend & 12" stock converter, that car was a handful on the street with its torque, Would definitely out run my 74 360 Dart, Stock 400s had a whopping 7.8.1 compression too.