Is the 70 Swinger on the road or in a 1000 pieces ?
Is the 67 318 and 8 3/4 already in it or is it still a slant 6 car ?
Have you done a Compression test to the engine ?
What's the condition of the engine?
Is the car stock or already got some modifications ?
Are you willing to upgraded gears and stall, if so how far ?