want to put a 440 in my dart

Some of the 440 motorhome engines came with HD rods as used in the 70/71 440-6 pack engine. Check your casting numbers to see what you`ve got. www.440source.com has a great archive of casting numbers for big blocks as well as a host of new and used parts. As the guys have said you can use the `67 440 heads with a casting number ending in 915 to boost your compression as they are closed chambered heads. Exhaust manifolds/headers are always a major issue when installing a big block in an A-body. As long as you`re not building crazy hp the Schumacher header will work well and is a good choice for the money. In all honesty you should probably build the car backwards and start with installing a good 8.75 rear end (from another A-body), upgrade the front brakes to disc or 10" drum and install thicker torsion bars. Once those things are done then move on to the drivetrain. You`ll need a good radiator too so keep a lookout for one while you work the other things. Welcome to the site 70dart831 and good luck!