64 push button 904 .bs session talking about putting late model 904,low gear set, lockup guts into a 64 push button trans. we know 64 trans has rear pump and bracket on vb that move manual valve is different. we also heard that imperial services(we think that is correct) will change over a later trans to work with your pb setup. anything we are not seeing/thinking about that would prevent this change over? thanks in advance.