MOPAR BIG BLOCK AND SMALL BLOCK K FRAMES : eBay Guides

there is no difference in k frames from 318 to 440 k frames for 68-74 b and e body cars. the only difference is for 426 hemi k frames. don't be fooled thinkin you need a "big block k frame".  the motor mount position are the same. I have a 318 k frame with a 440 mounted on it with stock big block mounts with no problems.