this one is a 300 amp 1950 something Pretty sure a 1958 but haven't confirmed the S# yet
it has the Chrysler industrial flat head the block is 23" long meaning it is a 230 CId engine
the 25" blocks were 251& 265 CID & the 30" blocks were 331CId there were some larger Chrysler 6 cyl flat head engine including 1 monster @ 413CID Also one called the A57 multibank it had 5 251" blocks mounted to a Central core crank case with 5 crankshafts gear connected to a single output shaft.
The flat head was produced for welders, pumps, forklifts. and stationary applications at least through 1972
I can hardly wait till I have the spare time to start refurbishing this old gem