hey guys i have an original 289 thats rebuilt couple years ago. its bored out .060. theres a hipo cam but i am not sure of what type (the owner before me put it in) i have an edelbrock 4bbl carb and intake. edelbrock dual timing chain. full msd ignition. pro billet dist. and an aod tranny. I am wondering about how much horsepower do i have?? and i am thinking about getting heads. but i am new to this so what are the best heads that will give me the most hp? and will my engine last long enough to upgrade heads? or should i just wait and get the crate with aluminum gt40s that have 340 hp? and looking to converting to EFI as well so i want to get heads that will work now and work with the EFI conversion.