If the 714s have a heart shaped combustion chamber, they are like the 302s. That number sounds vaguely familiar. Later: I did a little websearching and it seems they are brothers to the 302 head. Heart-shaped chambers, use a rocker shaft, 1.78/1.50 valves. No need to use 302s when the 714s are the same head.
And no, they are NOT Magnum heads, at least the type of Magnum that has rockers on studs.
