Yes, 140 was the horsepower. It is a 235, and should be a hydraulic cam engine. Generally speaking, solid (truck) vs. hydraulic (passenger) lifters is the main difference, depending on year. Some years, an automatic equipped car would have a different cam and a bit higher compression for more power to make up for losses in the trans. Otherwise, they are essentially the same.
According to my research, the Thrift Master name ran from '47 to '62. The Blue Flame name ran rom '50 ('50-'52 on Powerglide only)-'62.
