318 Poly in an Early A Body?

With the engine, the cons out-weigh the pros... actually, I don't see any pros. Same with the transmission. 727 will be a total horepower robber for a small cube engine, in addition to a nightmare to install. You will need to do major surgery to get a 727 to fit in a narrow body. Like fklskv said, LA motors are more plentiful than the poly motors, and the same can be said about 904's vs 727s.