slick158

Hello mototheads, newby on here. Have had my 92 c4 lt1 since 2006, I'm second owner, like the car, but, at 170k/miles, I have decided to build motor for it. My machine shop connection has some pretty good ideas for me, but, I was wondering if anybody on here has suggestions as to what to do with the heads?
I don't know whether or not I should buy some trick heads, or any other sug's, or, just do some porting/polishing on existing. I am shooting for 450ish HP. I am currently in the research mode. Thanks much for any feedback!