I just took everything off that could keep the engine from moving, raised it up, shoved it to the right until the stud bumped on the top of the k-frame slot, then tightened that nut. Then I just sat the whole thing down. Now I've got it all the way to the passenger side - no slot showing. The engine isn't level right now, but the steering coupler still hits the header. I could've raised it up and shimmed the driver side until it was level, but you know what, it was hitting while I had it lifted on the hook and the shims won't change that.
I'm done. What did the header say to the mechanic? HIT ME!
I think if the headers were a problem, you may have to dimple them a little but, no way should you have to mangle them to fit. I f you do, they are junk.
I don't know if I've asked this before but are you sure you have the correct headers for your application?
71 duster?
360 engine?
Biscuit motor mounts?
4-speed?
A call to Dougs headers is in order with the updated info from everything you have tried itemized.
I think you are down to a manufacturers issue as there are literally no other adjustments you can make.
I've been down this road before with ill fitting headers and swore I'd never do it again.
I went with TTI shorties and eliminated all the ill fitting bullshit for good.
Yea, I probably gave up a few HP over a set of long tubes but I made it up with some real good tuning.
No more busted knuckles, scraping them over the driveway or any matchstick left on the street, easier plug changes etc..
My car can run mid 11's .
I m happy with that.
Here's a pic of the shorties on my 408 Stroker Magnum.