500 can be done with under 20k pretty easily especially if you have forged rods. Some have done this w/o any major tranny work and just a converter, pump mods and valve body...

hybrids- 2000
h2e 2400
studs- 700
fuel system-1000
trans mods 2000-4000
tuning 500
intake- 50
exhaust-300-400

with forged rods you'll be able to reach 500 for 10k range imo.