Monday night I drilled the new holes for the driver's seat. Still not sure it is final. Looked at what it would take to mount the passenger seat. Decided to think about it before any more hole drilling.
When I test fit the parking brake handle previously, it only traveled about 1/4 of its available travel before hitting the dash. The original dash must have had a relief or was mounted so that this area was closer to the rear of the car.
In order to compensate, two new holes were drilled allowing the handle to rotate toward the firewall. Of course, this also lowered the moving parts. So, now instead of the handle hitting the dash, the cable attachment hit the cross tube. A relief was ground for clearance. I may reinforce the new hole later. To be honest, the cross tube is still very stout.
The pie cuts that had to be made in the middle section of the dash were welded up. I didn't grind them yet. I was tired of grinding welds. It will be there the next time I work on the car.
As with everything on this car, two steps forward and one step back. The brake pedal mount interferes with the lip on the bottom of the dash. The section between the black lines will have to be cut and removed.
My count may plus or minus a couple, but I counted 47 holes filled. And ground.
There are still 7 holes for the firewall pad attachment. Instead of pushing the plastic pins out into the engine compartment, I am thinking about rosette welding bolts to the remaining holes and then securing the pad with plastic wing nuts.
I also left the hole through which (I believe) the e-brake cable will pass.