I tried posting this on the exhaust board but no one knew or they just didn't want to respond. Anyhow, I need to order header gaskets today for my 350 TPI and I need to know if I should order the circle gaskets or the square ones. I did not put the headers on (they were on the car when I bought it) and I am having someone put the gaskets on, so I can't check to see which ones they are. I want to order them today so any help is appreciated.
Thanks guys.

 

I run stock GM exhaust manifold gaskets w/ great sucess. They don't blow out or leak like paper gaskets. I buy them locally for about $5/set too. Just my $0.02

 

I use the Mr.Gasket sets. I can't remember what exactly they're called, but make sure that they have the hooks on each end for the first and last header bolts. This way you won't have to completely unbolt the headers to change gaskets. They were the rectangular kind.

A few years ago I changed the gaskets on my Edlebrocks (which I no longer have) and I unbolted all the bolts to change the gaskets. Well, needless to say that I will NEVER ever do that again. It was a bitch trying to re-align the bolt holes and I think it took me about 8 hours to change both gaskets. With the "hooks" at the end of each gasket, you need only unbolt the middle bolts and leave the end bolts out about 1/2 way to 3/4 way and slip 'em on and off.

 

Mr. Gasket "Ultraseal" part# 9501 has always done me right, on both oval and D-port heads with a wide variety of headers.