Headers for Indy 440-1 Heads in a Duster??

Other than custom building a set, has anyone had luck with Headers for Indy's 440-1 heads?(without going fenderwell headers)
Currenty the cars got a tubular k member, no t-bars, rack & pinion, powermaster mini starter, and inner fenderwells completely intact, running stock heads and 2" tti headers, Going to the 440-1 heads and tti says they're 440-218's wont fit a duster without "major mods". Was trying to keep it a easy and inexpensive as possible.
Thanks