i picked up a 73 413 for $200 and its a low compression motor ,, but ive already put 906 heads eddy rpm cam and a tm7 intake , that motor sounds killer .but yeah if i was you i would go out and find 360 or just pay more for a 440 setup .if you dont already have the big block setup and not willing to spend the money and dont do it , it will be a long journy and money blowing setup, i know ive done it twice .