i put a 440 in a 68 dart,will a set of headers for a 383/400 work with a 440,they were given too me to try i hope they will work.

Should b a # most likely on the outer side of the flat flange

I once had a '71 Truck that came with a 383. I stuffed in a 440 a few months later. It had headers on it too. The only issue was the fact that one block is taller than the other. When I put the 440 in, my pipes rattled on the frame cause the headers were raised with the engine. Just a little adjusting and all was good. As far as the headers mounting up, should be no worries. Good luck!

i've tried and i even took the engine mounts and towers off and jacked the engine up with no luck,is it easier/better to pull the engine and put the headers in,then set the engine in,man i should have left the small block in it,on second thought i should quit griping and just get it done,lol,it should b worth it,i hope,thanks everyone.

Most likely they are not for an A-Body with a 383, they are unique and are only made by a couple vendors. TTI has the big tube headers (CPPA type) and there are a couple of old designs with 1-5/8" tubes made by Headman and Blackjack I believe.

Hedman's 78030 header (original application is for B/E bodies) will fit a 383 into an A-body engine compartment but the 440 is just too tight!

Hedman 75150 1 3/4" 3 inch collector Fits an A body with a 383 and power steering.

Bigblockdart.com had some threads about this.

do you have too remove all of the steering compononts,drag link,maybe remove torsion bars,to get headers installed

This is a wide engine, so yes...it would certainly help to remove the T bars. The center link is in the way in every header install I've ever done too. Also, get the front of the car as high as is safely possible.