Bringing this back to the top after installing these into my new hood. Here's what I found.
1.) The QL-25 latch has a thread length 1/2" and a threaded diameter of 3/4" x 24 extra fine thread. The standard garage handle would have 5/8" hole drilled for them, so you could enlarge that hole, but you'll have to deal with the screw holes that the old latches left. You may me able to go up in size to something like the QL-50 with a larger flange that may cover those holes.
2.) Due to the thickness on a Mark IV hood where the alignment ridge runs along the bottom of the hood, the thickness here is around .7" thick. The standard QL-25 won't reach. I contacted Quick-Latch and they pointed me to their mini latch extension nuts. These are awesome and made the whole installation very easy. These a a fairly new addition to their line.
https://www.quik-latch.com/mini-latch-extension-nut.html

3.) I marked my hood and drilled a single small hole all the way through for alignment. Then, using a 3/4" hole saw, I cut the 2 holes in the top of the hood without going through the lower shell. Due to the barrel width, I had to drill the bottom holes with a 7/8" hole saw. From that point it was just fitting the two pieces through the holes and tightening. After paint, I'll apply a little green or blue locktite when I permanently mount them in place.

I plan on running up to Shapiro in the morning to by some aluminum plate to mount the buckets to, then back to fitting more parts on the car.
1.) The QL-25 latch has a thread length 1/2" and a threaded diameter of 3/4" x 24 extra fine thread. The standard garage handle would have 5/8" hole drilled for them, so you could enlarge that hole, but you'll have to deal with the screw holes that the old latches left. You may me able to go up in size to something like the QL-50 with a larger flange that may cover those holes.
2.) Due to the thickness on a Mark IV hood where the alignment ridge runs along the bottom of the hood, the thickness here is around .7" thick. The standard QL-25 won't reach. I contacted Quick-Latch and they pointed me to their mini latch extension nuts. These are awesome and made the whole installation very easy. These a a fairly new addition to their line.
https://www.quik-latch.com/mini-latch-extension-nut.html

3.) I marked my hood and drilled a single small hole all the way through for alignment. Then, using a 3/4" hole saw, I cut the 2 holes in the top of the hood without going through the lower shell. Due to the barrel width, I had to drill the bottom holes with a 7/8" hole saw. From that point it was just fitting the two pieces through the holes and tightening. After paint, I'll apply a little green or blue locktite when I permanently mount them in place.

I plan on running up to Shapiro in the morning to by some aluminum plate to mount the buckets to, then back to fitting more parts on the car.