Pfft, buy a low mileage $300 motorhome 440, do rings, bearings and a fresh valvejob on the heads. Cam, headers and intake will get you there without breaking a sweat with stock parts. Best of all you can bolt on heads and do a stroker kit for another easy 150-200 HP in future upgrades!

I went down this road with a 318 and, in the end the BB was cheaper, faster, easier to service and much more capable!