Yes, it probably is a 250 with integral intake/head. Most opinions would be to toss that head and get a 250/292 head with separate intake. Unless you've lost all sanity and want an automatic or you want a 5spd, then use that 4spd. I don't know what model or manufacturer it is but, it is a truck tranny with granny low and it's all aluminum used in the 1/2 only. My friend had a '79 short, 1/2, 250, aluminum 4spd that he bought new. He towed a 24' trailer every summer for 20 years and as far north as Calgary, Alberta, Canada.
