If you go to bruneauperformance, there are pics of the re inforcing that can be done to the housing. Does your diff have 2 upper control arms, much better for a 4 spd car. There are also bearing sadles that beef up the caps. The bearing caps are the weak point.

Elroy wrote:

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I had the stock pumpkin in my 56 Chevy Bus mans coupe with a LT1 370 hp and a muncie and it never gave me a minutes trouble.

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 Yeah, the driveline is usually OK if you aren't too hard on it.

If you get rough with it the bearing caps are a weak point, then the axles. I once broke both the left and right axles on the same night with a 409 powered 62 Impala.

The driveshaft is also a little bit on the weak side but it's usually stronger than the rear end.

If you want to spend the money, you can get a brand new 9" Ford or 12 Bolt from DTS or Currie that will drop right in. Inland Empire makes a big 1350 series driveshaft setup for these cars as well.

 

Sweet ride!  Great to see another 64 Safari on here  

You are correct to watch for the 2 piece drive shaft.  The shaft will be plenty strong, but the hangar bearing is the weak point.   They tend to deteriorate over time with a manual trans, or big horsepower.