I knew one Ford Racer, Ted Wells, that had one of the 50 1966 lightweight Ford Fairlane that Ford had assembled and prep for drag racing only, his was a 410 HP with a single four barrel originally.
We were talking about engine RPM during a rain delay at the Orange County track back in 1975 or so, I was racing my 1970 Cuda stick shift 426 Street Hemi motor and he ask me what RPM I shifted it at and cross the finish line I told him I let the clutch out above 6000 RPM with throttle on the floor and shifted it at 7000 RPM with 5:38 gears and 9x30 inch bias ply Firestone slick it would cross pretty close to 7000 RPM in the 1/4 mile.
He told me he let his clutch out at 8800 RPM and shifted around 8000 RPM and cross above 8000 RPM
I didn't have a clue how high those 427 FE motors would rev