Not sure what's wrong with the engine, I know one piston isn't working, my mechanic said that I would need to fix the heads, I could have it fixed for about $300 total. BTW I'm now in Mexico so I don't have to worry about smogging the vehicle since it will have Mexican plates. For $500 I can have a used 454 in excellent condition installed. I'm not too worried about gas mileage since I will only drive it to go wheelin'. What is the power and torque difference between my current engine and an early 80's truck 454 engine?