Demolition derbys sure have changed since I was a kid. Gone are the junkyard engines. Now days derby cars have a purpose built engine like this SB Chevy 350. This particular one produced 365 HP and 391 LBS Torque.
This Buick 340 was a stock restore rebuild. The customer will be installing this in a 1967 Skylark. Back in the day these engines produced around 300 HP.