found a used 318 with 70000 miles on it.beleive he said its a 1968. has a 340 purple cam in it with j heads. hes keeping the heads but the stock heads come with it also throw in a set of rebuilt never been on an engine 360 heads. has receipts for close to 600 in head rebuild. wants 300 for everything. can the 360 heads be run on the 318 or would i be better off using the stock heads. its going in my 70 d100. its just a driver not going to be raced.im thinking the 360 heads will run but maybe lower compression. thanks