advice on driveshaft
I recently tubbed my car.Everything is squared away except my driveshaft.I have yokes on both ends(trans and rearend)that are 1350s.The driveshaft I have been running is out of a 74 Nove w/250 6cyl.Not sure what the ujoints are on the driveshaft,they measure 3 1/4' wide and have 1 1/16" diameter caps.Been running crossover ujoints(at least that's what I call 'em).Real question is,my pipe is only 2 1/2" in diameter.Do I need to step it up?Like I said,I just tubbed it,but am not making any extra power as of yet.Had no problems before.Money is tight and was wondering how much power it would safely handle.Estimated my power to be 600hp,don't really know.Car is about 3300 lbs with me in it and have run a best of 6.90 at 99 mph in the 1/8.Any help very much appreciated.