Thanks for all the feedback.
The 3.5x12 inch tin is what I had. It is a little big. I have another one that is 3x13.
The pot scrubbers are wired so that they are vertical. there is one in front of the carb vent and one on either side by a couple of inches. A couple more would be better. I need to source some coarse copper wool, then I can engineer a better oil mist catcher for the end product.
I chose the drain locations for the most direct route, that still offered me enough clearance to get at the fan belt nut for turning the engine or tightening the belt. The carb vent ended up being between them and I don't know if you can tell, it angles down just a bit to clear the clam shell when it's closed. That with the interference of the Blazecut mounted on the back of the clamshell, I was limited for placement.
The fittings that I found would not support 5/8 tubing. For the end product, they will be welded on, so I'll have more choices. After a few weeks, I'll remove it and open it up to see what's going on, and go from there. I'll also monitor the carb filter lid for oil.
These cars are ever evolving.
BTW, you'll never be finished, and we're grateful for that. Thank you.
CG