Dynamic String Manipulation

I have the following data in a table;

Create Table #Table (Column1 Varchar(1000))
INSERT INTO #Table
Select 'Execute Procedure @param1 = 100, @param2 = 1000, @param3 = ''longtext'' '
UNION ALL
Select 'Execute Procedure @param1 = 10, @param2 = 1000, @param3 = ''longtext'' '
UNION ALL
Select 'Execute Procedure @param1 = 100000, @param2 = 1000, @param3 = ''longtext'' '
Select * from #Table

I want to get rid of @Param1 in every row of the table so my final results look like this.

Create Table #FinalTable (Column1 Varchar(1000))
INSERT INTO #FinalTable
Select 'Execute Procedure @param2 = 1000, @param3 = ''longtext'' '
UNION ALL
Select 'Execute Procedure @param2 = 1000, @param3 = ''longtext'' '
UNION ALL
Select 'Execute Procedure @param2 = 1000, @param3 = ''longtext'' '
Select * from #FinalTable

The tricky part is that the @param1 value length varies so a straight forward substring or replace function won't work.