here are a few "big block" crate engines for the bowtie lovers
http://www.sonnysracing.com/engines_may_2001.html
how about a
555" CHEVY 700 HP $14,900
555" CHEVY 870 HP $15,900
565” CHEVY 940 HP $16,500
615” CHEVY 1000 HP $20,500
632” BIG DUKE 1120 HP $34,900
712" PONTIAC 1400 HP $42,500
now those are some
BIG BLOCKS 
