Any clue on my hp?

[1970witha355]

Im new to the forum and this is my first post. I recently purchased a 69 c10 project. The engine ran good but I wanted to see what it was made of so I took it apart. It is a 1975 350 4bolt main, the block has been decked to zero "the pistons are flush with the block" It has 4 relief flat top 30 over pistons, 441 heads, isky cam with 390/410 lift and 268/274 duration, torker 2 intake, stock carb. Anyone have a guess what the hp might be on this? Everything looked really good so I am hoping to have it back together and on the road this weekend!