i assume he has the 2.74 first gear in trans, the 340 needs the same ratio, in stock, you blueprint the engine, deck hgts are equal hgt, rods are equal length crank stroke is equal, also is balanced, head chambers are equal size, ring combo is important, as are bore finishes the cam is usually a dwell nose style, needs lots of spring press, just food for thought. ring tension is important. and width is usually narrow face style
