I was going like the blazes on my 65 442 until I started having trouble with the trunk floor. The electrical panel needed some upgrades and looks like a subpanel to get the welder going. Long and the short of it is....it was easier to buy another project from a tow-guy I know. Then, of course, I needed a parts car. I'm getting back to work on my 442 trunk soon, no BS, just had to get away from it for a while.
Parisienne is basically a Catalina with an Impala chassis. Sort of...

 

That's a solid Pontiac you got there. What year Impala frame did you use?

 

These large Canadian Pontiacs come factory on Chevrolet frames with Chev running gear. Has a 283 with cast iron powerglide. All GM did was drop the bodies on the same x-frames for 58-64. They used the Chevy side rail frames from 65 and up.
This frame has the usual reinforcement on the upper surfaces for strength. Inside, you wouldn't know it wasn't a Catalina, except for the column shifter which goes P R N D2 D1 instead of P N D2 D1 R like the rotohydramatic.
Now I'm wondering, is that correct for the roto shift pattern? I'd better go get my first morning coffee !!