Dear Skoczek,
I am involved with building an engine and we went through this in January. We had specs for a custom cam and discovered that actual cam blanks for hydraulic cams were very scarce. A significant effort finally located a cam manufacturer with blanks and after a six week wait for them to complete the orders in front of us, we finally had the cam.
I am not fluent nor adroit with cam specs translated to ordinary understanding, but the lift does seem rather high. Also the scarcity of on-the-shelf cams may possibly have motivated Comp Cams to recommend what they have available.
I would suggest getting another opinion. Try Jones Cams. They're old school and do custom cams. They also provide camshaft recommendations without charge. You could compare what they recommend with the Comp Cam spec card.
http://jonescams.com/street-performance/
Now is the time to put on the proverbial brakes and make sure that you have the cam you want, although be prepared that obtaining it may be challenging and cause some delay in completion of the engine build.
Warmest regards, Chuck Engles