I picked up one last year at the crusher yard in a 2 1/2 ton 56 truck. It has a L56 code and is all STD. I got it for the crankshaft, incase I ever need it for my 283. Only prob with it has no side mounts. It could be built and put in my 55 car since the car still uses front mounts.
I have an old desktop dyno but playing with it, the smaller the cubic inch you go the HP seemed to be the same or slightly higher the smaller you went on cubes when using a Turbo.