I ran a crate 350 in a '78 Suburban for ten years with no problems at all. Pulled a 20 foot Sea-Ray a bunch with it. Went through 3 transmissions but the engine didn't even smoke when I traded it for a '53 6400 this spring.
Like Seon says, the $1295 one will do you unless you just like showing off.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.