What to do...

Alright so my slant 6 is dismantled right now, and wont be going back into my dart until spring. I want to increase the power on it because lets face it 145BHP is not much. So my options are:

1. Throw lots of money into the slant 6 to make it perform the way i like

OR

2. Grab a V8. (if you pick this, specify either SB or BB)