Thoughts on a 390 cu in. stroker from a 318?

273 said
well your truck was rated 245 hp net so if what you done gained about 30 hp, be 275 hp net

Rated at 250 it's an r/t model. Just a guess on the HP. Cam is bigger, kegger intake manifold heavily modified, headers, I can't remember what else.
By the way I was really just kidding about 275 hp being too much for me lol