Yes you can feed meat and food like that and your fish will grow faster, however there has been alot of discussion around about the long term health problems of power feeding your fish all this meat from warm blooded animals (beef heart etc).
The theories go somewhere along the lines of fish are cold blooded animals (temp is regulated by the environment they live in) and cows are warm blooded animals, the problem is supposed to be when you feed fish warm blooded meat they cant process the fat in it and it builds up in their liver eventually giving them liver disease etc, so they grow faster but don't live as long.. Unsure if this has any merit but it sounds like good reasoning to me. Guess it is just like the bloodworm debate.. People have always and probably will always continue to feed both where I wont touch them
As for what foods are good, I have seen shrimp recommended as they are both salt water (cant carry anything that will affect our fresh water fish) and cold blooded.