David, where did you hear that Granatelli was making SCT meters?
For SC's C&L is probably still going to be your best source. No one likes to make a transfer function that matches the OE during those years, particularly since Ford changed the transfer function of the meters a couple times during the SC years. Most any current offering is going to match the more current meters. If Pro M stops making meters then I would not expect anyone to start up making these obsolete electronics anymore.
As for the stock meters, the important thing is to keep your stock electronics that came with your car. The meter housings are all the same in regards to flow characteristics, and started appearing on SC's in 91 and NA 3.8's in 92. There is no substantial benefit to changing meters unless you want to do the MN12performance mod and have your car dyno tuned. I would not do the MN12 performance mod unless you are having the car dyno'd.
Really, for the $135 it costs for a 76C&L, why even bother with anything on the stock MAF?