v800 was the factory dual quad 57-58 318 poly actually what Christine would have had in the movie. The biggest detune I ever done was pull the 318 poly out of my 66' sweptline and replace it with a la 318 with the edelbrock performer package never had the slap your head off the backglass burnin tire torque the old stock poly did.
The only reason I pulled the poly was it would smoke a little on start up and I wanted to preserve it so it is still in the storage unit. and the warmed over la 318 is still in use in a 78' short box 4x4.