Is there a source for K-frame bolts (the four that bolt the k-frame to the frame rails). Is there a torque spec for these?

I would use grade 8 bolts and nuts. Then follow the recomended torque specification for the diameter of the bolt.

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Part of Tyrde-Browne Racing

Better look for some originals. They are shouldered and a regular bolt wont center up and locate the k-frame correctly.

I hit the wrecking yards and grabbed a couple out of each car when I need a set for my sectioned k-frame project.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car

Thanks, I found a couple of Darts and Dusters yesterday at a junkyard and pulled a couple. They came out of the junkyard car a lot easier than mine did.