Were to get HP manifold flanges

I'm trying to fix an exhaust leak on my HP manifolds.I checked by hand and the leak is at the flange even with 2 gaskets. The exhaust guy used some crap flanges to begin with , then I went from 383 to 440 and had to tweek the pipes to fit. Now I want to start over with new flanges and start with 3" pipe and go all the way back, I currently have 2 1/2" with 2" tail pipes. Weres a good vender to find these parts at? Maybe they are a stock item at an exhaust shop. I want a hole to hole fit with no slotted holes or sloppy fit though.Thanks

http://www.accurateltd.com/Flanges_c_10.html

I had a similar leak, what Tom from Accurate suggested & I did with good results was bolt the headpipe to the manifold with the new flange sandwiched between the old flange & the headpipe... Tack the two flanges together then drop the pipe down & fully weld it.. Winds up with a 1/2" thick flange & no more leaks...

Excellent idea Randy! I checked Accurate and they have the 2 1/2" flanges. I beat the crap out of my pipes when I went to the 440 so I want to clean everything up and also install an H pipe.Is it even practical to try and run 3" off the manifold? BTW, I found my engine problem, loose torque converter bolts (like hand tight, doh!) I also found a guy to build my engine to go 12's at a decent price.

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Is it even practical to try and run 3" off the manifold?

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When Andy did it w his 470(alum heads & 68-70 hp manifolods) he made iirc 550 hp