Slant 6 to 340 swap

Don't have the car yet...I'm building the engine first, will get a car later.

Hoping to find a 70-72 Duster, or a Demon.

I can get a 8.75 rear and 727 pretty cheap locally. I figured torsion bars and radiator, too. Do you have to change the K-frame?

I'm kind of surprised it would be real expensive...since I don't care about a numbers-matching car I thought it might be cheaper to find a not-too-rusty /6 car and convert it myself, given the current market prices.