350-400hp for $5k??

[DTMsurf]

I recently picked up my 72 lwb and so far I've done brakes, suspension/lower, starter, drive shaft and interior stuff. Basically what it needed that I could do on my own. Now it's time to address the tired drivetrain. The truck is a good little runner but lacks oomph, it always has a drop of oil on the pan and I noticed oil on the starter bolts when I swapped and blanketed the starter. I know a great trans shop and my next step is to take it to them to go through the stock th350 and make sure it's solid. Then I need to focus on the motor. I don't have the tools, space or experience to do an engine swap on my own so the question is do you think I can get a reliable motor done for $5k out the door? I'm hoping I can get 350+hp and don't care if it's a rebuild of my current power plant or crate motor. Everything on the motor is stock.