too nice to mod?

I sold my 69 slant six dart two weeks ago (basket case) and bought a restored 69 GTS 340/727. Problem is, the car is too nice to mod. The engine was done in march, basically stock with a street strip cam. This was the car I've wanted since I was a kid. It's a great cruiser, but its not nasty enough. Looks like I'm going to search for a clean stripped down slant six car and drop a 440 in it to get the kind of violent driving experience I'm after. Anyone else have these issues?