KF had considered putting the Allstate badge on the 49 Kaisers and pictures exist of the script placed on a car. There were changes to the grille layout and interior to differentiate the Kaiser from the Allstate. Nothing came of that and as the ad states, the Henry J ended up being used and the Allstate badged car was introduced in late 1951.
I agree, I think the asking price is a bit too high. I noticed the Allstate cylinder head is not on the engine, hopefully it's with the car...it's probably one of the more valuable Allstate specific bits.