[Carnut427]

First, an explanation of "-riser"...first came the Low risers, which allowed plenty of room between the air cleaner and hood. Then came the High risers, which were a race-only setup which needed a bulge in the hood for clearance. Finally came the Medium risers, which fit under most stock hoods and put out almost as much hp as the race-only High risers.
The Ford tri-power manifolds are low risers, which refers to the height of the carburetors in relation to hood clearance, but there are also port size differences between a medium riser head and low riser intake. The intake will bolt up to the Edelbrock heads, but the intake port in the heads is smaller than the corresponding port in the intake. Fortunately, there is plenty of metal in the Edelbrock heads so that you can open them up with a die grinder to match the intake ports. So to answer your question, yes, they'll fit, but need a bit of work for best performance.

Dan