Performance Questions 225 vs. 360

Hey, guys. Yes, I know I ask a lot of random questions in a lot of different forums. I hope you all don't mind. I'm just trying to accrue as much information as possible before I make the decision on what to do with the engine in my car.

The option that' at least for now, is starting to look more and more tempting, is to keep the slant six. The only question is, do I want to trick it out any? Well, that's a dumb question, really. Of course I do. Lemme try again: The only question is, how much does it cost to trick out a slant?

The engine in my car is a 225 /6. It's the original engine for the car (a 74 Duster). My main curiosity is, how much bang for my buck can expect when modifying this engine?

I would like, at very least, to be able to make it comparable (if not better than) the 360, since it was the biggest stock engine for the year of my car. How much money would it take to get to that point? Would it be cheaper than just putting a 360 in? (The engine swap website makes it seem like there's actually a decent bit involved in swapping to a small block. From changing the drive shaft length, to changing the front breaks, etc...)

I'm open to any kind of modification suggestions. I'm going to have the engine out to clean it up, paint it, probably rebuilt it, and generally get it looking nice. So I'll already be in a great position to do a little hot-rodding on it. I've read that turbocharging the engine makes a pretty big difference. Any suggestions on a good economical rebuild that involves that?

Essentially, as I said, I don't really want to invest the time and money if it doesn't mean being able to outdo one of the small block v8s at a comparable price. I like thinking outside the box, and I certainly know that the slants can be made to whip up on the larger engines, but I was curious if they could do that at an economical price. Thank you in advance for all of your help.

(For reference, Allpar lists the 360 at 175 hp @ 4,000 rpm, and 285 lb-ft of torque @ 2,400)