[Buddy Rawls]

Actually, mine will be plumbed exactly like yours. Lower inlet Of the expansion tank is plumbed to the block. In my case, one of the water pump heater hose outlets.
The upper vent port (not the radiator cap pressure release) is plumbed to a high spot in the cooling system so hot air can be exchanged and equalized between the
expansion tank and the cooling system. In my case, I’ll tee in to the upper radiator hose, yours goes to the top tank. And the radiator cap pressure release port goes to the catch can.

No, I Do not have problems currently. Just adding the Harrison Tank
to Match the authentic race cars (FIA, USRRC, etc). I’m just trying to cover everything. I’ll finish it this week schedule permitting.

Is yours an original? or a modern CSX? either way, nice. Id love to do some webers. For now Ill have to stay with my C9OX Ford Intake and 650 DP.