hello fellow inliners. back again with a few guestions. planned on lagdons headers, but budget will not allow it. i did come across a 292 ex.manifold with a 2 1/2,3 bolt flange at a good price. so i grabbed that puppy. the guestions are, what size exshaust pipe do i use? and how far do i run it back? this is on a 68 nova 230.HEI,500 edelbrock,offy intake, exshaust in the making. the cam and all will be next after this is done. thanks.