Here is the other idea that I'm working on. You can overlap two of these. The overlap area is more than an inch so I'm thinking that a thin coat of RTV would make a pretty good seal. The aluminum is only 0.030 thick so it gets really flimsy in the center but it should work okay for a drag motor.
I need this in Max wedge ports!!!!!
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
