I've used Denny's and PST. Both worked well. Denny's has the better customer service but PST is quicker. If you can find the right size, the used 4" steel NASCAR driveshafts are pretty affordable at $75.
http://www.musclemotorsports.com/dri...eel--used.html
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1967 Firebird ragtop, 464, Weiand 8-71, ported 6H heads, Hyd roller, 4L80E, paddle shifter, Moser 9", Cal-Tracs, Vintage Air, Corbeau seats, 13"/12" disk brakes, Hydraboost, electric cutouts and M&H drag radials. 
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