what can i expect from my 360?

Thia is my first thread so please be gentle lol I have a 73' 360 block and crank that are at the machine shop getting worked over. Theyve been there over two months sadly for basic work. Im runnin stock crank and rods with keith black 191 pistons in a .060 overbore so the specs are as follows. 12.5:1 compression or close atleast. Minimum .500" lift cam with no more than .300 durarion advertised of course lol either magnum heads ported and flowing as good as possible or 915's ported. I havent chosen yet. And a proffesional products air gap intake fed by an 850 demon converted over to e85. Hoping for close to 500hp at the crank