Spent a couple hours today, ahem, adjusting my pins, and measuring the engine about 12 ways to see where the air cleaner tops and linkage ends are going to be, then socked in the pins with a couple screws...
...and closed the lid, hoisted the car up and took a look at how the receivers might fit.
Yup.
Now it's down to making the diagonal brace thingie that ties the lip of the tub to the firewall, trimming and attaching my receiver thingies, and riveting it all in.