Interesting read about experiences with the AGR boxes/customer service. Seems like it could be hit or miss.
Here's another player that I found...Borgeson 800 series 12.7.1 with equivalent to .210 valving feel (different valving unit build from stock) for $445 from Summit and with good reviews. Anybody tried this one? Very interesting. Ridetech raves about it on the protouring.com website and comes with a 3yr warranty.
https://www.summitracing.com/parts/brg-800130
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1970 GTO (Granada Gold) - 400 / TH400