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1 3/4" is a little big for a mild traditional350 , but it won,t be a huge difference. Long tube traditionally makes more low end than shortie headers. Advanced designs like tri-y can pull a little more low range power.
If you have a good exhaust now, I,d look into other factors such as tuning & regearing before downsizing exhaust.
 

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Tuning? Check all the basics--- timing , may need to recurve distributor , plugs , plug gap, Vacuum leaks, etc. Are you sure you have a 3.18 gear?
How old is crate engine? also retarted cam timing will drop yuor low end power.
 
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