I justdid a 400/727 into a '72 Duster. The Schumacher swap mounts and there torque strap was a easy to do thing. The 6 cyl. K frame needed a slight notch cut into it on the driverside, front corner of the mounting boss on the K frame. VERY easy to do.
For headers, I used B body headers and followed the instructions from big block .com's tech pages.
http://www.bigblockdart.com/techpages/BBody.shtml
The headers I had on hand are the Headman Elites. They fit a little better than the ones pictured. More so on the passengerside clearances.
IF you go this route, I seriously suggest the following;
Remove all the steering linkages before you try to install the headers.
Remove the steering column before you install the drivers side header.
Raise the car up after you install the headers with the engine. Use your baby sledge to clearance the pipes. Lower car and test steering. Make sure there enuff room to clear everything when the car is in jounce.
(Jounce is all the way down as in bottoming out the suspension as if you were driveing down the road. Clearances shrink when the cars weight is pushed downwards on the shocks and T-bars. Similar to adding 10 people to the front of the hood and everybody jumping on it to compress the suspension. You'll want clearance or the steering may jamb up on you.)
Exhaust pipe fitting done by yourself can be a tricky thing. If you can use a mig welder, your in. A pair of "S" bent pipes can be cut and made shorter to clear the bend area. I have a clearance issue that will be solved in this manor. It is the passenger headers exit being very close to the trans crossmember frame.
