what year big block is the best for swap?

[slt0066]

just wondering if you guys had any info, or if there was anything to look out for. I am wanting to find a big block for my 72 c10 short bed. Just curious if maybe the older ones, like early 70's are any better than newer ones or something like that.
I ve found a 1986 chevy truck 3100 with a 454 and auto transmission. would that be a good donor you think if i can get it cheep enough and just freshen up with a basic rebuild.?
what kind of hp can i expect .....and yes im like every one else i want 700hp on pump gas for $2500