V8 swap? Or turbo slant six?

I've just recently picked up my first car. 1971 Plymouth Valiant, 4 door, 198 slant six, three on the tree. I'm trying to decide whether I should swap the six banger for a v8 (maybe a 318, or B-block) Or if I should turbo the slant six. And since I am only 15, I am on a pretty tight budget. For how much it would cost, would it even be worth it to turbo the slant? Or for the money, should I just swap for a v8? If I go for a v8, should I swap the 3 speed for a 4 speed? I personally like the column shift idea though. But, im just wondering what you guys think. V8? or Turbo slant?


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