360 ENGINE BUYING CONCERNS/QUESTIONS

Hi Folks

I am going to look at a 360 this weekend (ready to drop in carb to pan). Engine was rebuild approx. 6 years ago (stored in a heated shop)and never fired. Owner sold the car ('70 Duster) as a roller. From what I know, All machine work done at a reputable machine shop. .030 over with flat top pistons, purple shaft cam ( specs to be determined), all new internals with windage tray and new auto oil pan. Rebuilt X heads gasket matched to an aluminum intake (not sure model) with mild professional porting by a race guy with a good rep. Engine supposedly built with a 400hp goal. Owner is a licensed class A mechanic. I believe that it has a cast crank.

What should I be looking for, and what would be a fair price?

Thanks for any advice and/or opinions