Hi Jerry. Yes we got these and tried them. Still all sorts of weird issues with fueling. I'm guessing we need to seal the carbs to the scoop and run a decent air filter before we can get to grips with it.
Our season is finished now lots of work to be done on the car before it's next out, modifying they scoop is one of them.

'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03