You can use a piece of 3/4 inch, and tighten the hose clamp on the cylinder head end (5/8 inch) real tight. It will be fine for a fire up, done it many times.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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