I have done the '67-'72 slant six k-frame to 340/360 engine since the 80's and it does work! The 340 motor mount bracket pre-'73 A body driver side with a '72-'78 small block 1/2 ton passenger side truck engine mount bracket. Even the truck small block mount is the same as the '67-'72 A body and the slant six k-frame driver side perch is identical to the V-8.

I would chime in on how that trick has worked well for me too--but right now I am busy counting how many of those mounts I have to list and sell.Thanks!!

Hey Guys sorry I didnt get to this sooner, but yes it did work I dropped a 340 with headers and a 727 and I ran the car down the strip, It worked great for me.
I then did the same swap using a 318 with headers and a 904 with excellent results.
So start hitting the junkyards for the truck mounts!

Dealers still stock them as far as I know.

I have a few of those truck mounts around And to think I used to throw them out