67 Barracuda Conv

If you go with a 318 for a runner motor, try to find a set of '302' cast heads from the mid-to late 80's 318s (not 100% if they'll fit a 273's bores well; I know that era of 360 heads-aka '308's' won't). Nice flow, hardened seats...put 'em on a buddies runner 318 (in a '72 Scamp) and he isvery happy with them