I did a mild, street driver 505" 440 for right at $7,500. Molnar crank and rods, Mahle pistons and CNC Stealth heads. It's just under 600 HP but more than enough for the street and a blast at the track!
You save a lot of money if you can build it yourself.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.