Big block engine mount question

[JMD]

Hi all,
I'm getting ready to stab the 454 back into my '68 K10, but I'd like to address a problem I've been having with the engine mounts first. I believe I didn't have the mounts installed correctly, and now that the engine has some power upgrades I want to make sure it's done right.

Previously I just ran a bolt with a large washer up through the frame, through the hole in the mount, and capped it off with a washer and a nut. This proved to be a giant pain because there's no room to fit a wrench between the block and the mount. I had to tighten it by hand and then hope it bit enough to tighten with a wrench. Not ideal.

I've attached a couple pictures of what I'm working with, as well as a picture of the parts that I believe I need. My question is, what's the proper way to intall this type of mount?