360 pros & cons vs 318

Lol the drums would do it... Well id make my own headers before i payed in upwards of 500-900... The trans problem, and parts would be no problem. B-block trans? The rb and b block trans are different? I only thought it would be good, at 200$ and then pistons 30 over at 200. My bro in law has some 452 heads. Im leaning over to the 360 though. Especially the magnum as its already a roller set up. So whats a good running 318 with milled 360 heads intake and eddy carb with comp cams thumper cam go for these days. I figure if i go magnum i wont need my old block anymore. So anyone know what i should sell it for?