First find the grain weight that the rod is rated for.
I think that the Skagit head should be 2.5 to 3 times the rod length. You can also use cheaters to accomplish this. You can make the sinking heads but by the looks of it theycan be complicated at best. Also, the commercial ones are coded so you know what the tips are.
You can use the running lone from the 7 weight but be sure to check the diameter. Also, it's best to have someone who knows what they are doing set it up for you.
Andrew Moy at www.tightlinesflyshop.com in Pine b
Brook is exteremely knowledgeable. I am sure you can call there and speak to him and you will be set up right.