Re: 292 I6 to 4.3 V6 engine swap
The 4.3 V6 has the engine mounts farther back towards the transmission than a small block.
You might be able to use a set of typical V8 mounts and move them back with a plate under the bottom bolted or welded to the crossmember.
I do know that the 4.3 was available from the factory in a '86 K10. If it was also available in the mid '80's C10's a set of those mounts would be what you need.
The 4.3 V6 has a 4" bore and a 3.48" stroke, the same as a 350..........
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