It's terrible you mentioned the frame Paul, I keep seeing things I should have seen the first time. Has the wrong head on it too, 54 was the last year for the cast iron head. Then the early aluminum heads sucked. They made the exactly like the iron head and the valve seats were too close to the head bolts so they tended to crack. Then they went to the 9 bolt head and they were OK. You could also put a unit top end on them.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!