Which engine 70 dart

I had a 69 valiant with a 225 slant six back in the mid 80's. It was my everyday driver, it would roast the back tires and had plenty of power, my intentions were to swap a V8 in it but I liked it so much I couldn't bring myself to do it. It was my first A body car. I traded it to a 72 340 cuda with a bad engine. I still miss that little car!

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