Just had a quick Google, found this.
Weber F5 S. Intake duration 265 degrees exhaust duration 260 degrees. Intake lift 0.340" exhaust lift 0.342".
Now this is only part of the story unfortunately. With these numbers one can only guess how that cam acts. Are these seat to seat duration figures? Or @0.050" lift? Or @whatever isky used (0.020"?) It doesn't tell us the rate of lift, if we knew this we could have a close guess.
But they would still be guess's.
The duration is on the low side, but if it lifts real fast, it would haul ***, and strong from fairly low down the rpm range. Many "performance" flathead cams lift slower than the stock cam, this hurts low down. Or it could be a slug down low, or anywhere in between.
Just a guess.
And please remember these figures are off Google, so may be complete bolox.
Hopefully someone with the full picture will chime in.
Martin.