I had the same problem, went to a set of schumacher creative services headers that way to avoid the $$$ money hounds ! PS or not 4 speed or auto ........... hello brother Frank
If you are doing a street machine no problem, but if you want a restoration then you have to buy the right parts. I have had quite a few big block A-Body's with hacked exhaust systems, no thanks!
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
