Check out the difference between advertised duration, duration at .050 and lift on the ebay cam compared to this Lunati 250/256
. The cam you linked appears to be a really old grind and the long advertised duration is going to cut into your mileage, manifold vacuum and low-speed torque pretty bad.
The newer cams hold the valve closed longer, open it quicker and further and get it closed again sooner. This will build more manifold vacuum and power for a given duration at .050 than any of the older style cams. I'm not a big fan of wider lobe separation angles but it will keep reversion at bay with restricted intakes and exhausts and deliver a little better mileage, especially when towing.
I'm guessing that the price is a factor but I really think you'll be much further ahead with a different cam and the one I linked would get my vote for your application.