1972 gmc jimmy BBC header ?

[Sandtrap9072]

So, i have a 1972 jimmy that has a 1973 454 in it with a turbo 400 trans. i recently took the long tube headers off to replace the gaskets due to a leak. my problem is that the headers continue to leak, the reason being is they are sq port headers on oval port heads. But this isnt the only problem that i have, the headers that are on it are the 69110 headman headers and barely fit between the frame rails. i want to replace the headers with the correct ones , but obviously these trucks never came with big blocks. I believe whoever put the big block in just took a hammer to firewall to make it clear and believe that it still sits on the orig 350 engine towers, but how do i know? I plan on putting a 350 back in it in the near future but is not in the budget right now. right now would like to find a header to fit in the mean time. ANYHELP would be awesome!

Thanks,


Nick