302 casting or 915 for 71 360 ???

Thank You All Very Much. But Ypou See All The Parts i Mntioned Above Are Already running in my 318 right now. soo Switching all the power making parts over for more street fun and to keep those pesky imports and newer muscle cars from aking me look bad all the time. might get a set of summer drag radials afterthis swap for a little insurance ??? He,he,he,he !!!