power brake conversion(65 Merc Half ton)

ive asked a pile o questions here in the last bit..( 390 vs cammed 460...snagged both btw) and the info has been quick and right on...now i
gotta ask.i want power brakes in my 65 Merc...i dont want to modify in any way if i can avoid it and have been told that i can use up to a 75 or so as damn near a bolt in if not a true bolt in....any people out there tried that???
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