408 horse power?

I just put together a nice 408 built from a 1977 360. It has a 4" Eagle crank. 0.030 KB pistions about 72cc heads with 2.02/1.60 30deg valves stock rockes and pushrods. between 9.5:1 to 10.0:1 comp. heavy valve springs good cam from comp. My boss or anyone else i know wont give me a rough horsepower rating. I also have a air gap intake and a 750 edel. carb hooker headers 2 1/2" exhaust 2:71 gear rear end 904 trans. This this is a rocket one it is broke in I will take her to the track but i at least want to know what horse power range I am in. Any one have any idea?