Mopar [HEAD] Aches PLZ HELP!?

For a 318 I wouldn't use anything but a 302 casting from the mid to late 80's, as they are a small closed chamber style head and from what we've found that they are the best heads for the 318. The 360 or magnum head, port volume is too large for the stock 318 type engine for street use and will not have the tq. or power in the lower rpm ranges. If your not turning this engine over 5000/5500 rpms this is the only way to go IMO.