slant six to 318/727 combo swap what do i need ??

Ditto above except my '74 Duster didn't have any steering linkage clearance issues.

You'll need in addition to the Schmaucher mount;

Cut the driveshaft

Possible larger rad. Even more so if the engine is not stock. A V-8 rad should be swapped in. I got mine new at Auto Zone for $200.

On the wireing harrnass, some cutting to shorten will be done, maybe a wire or to needs to be made longer. Radio shack has acceptable wire and shrink wrap tubeing. Soder them toghter and shrink wrap them.

The throttle and kickdown cables are best, IMO, replaced with Lokar or equal cables. There easy to install and fit. the operate very well. It saves a huge hassle of finding OE parts that can be expensive.

Up grade the rear from the 7-1/4 to a 8-1/4 or 3/4

Upgrading the front drums to discs and larger drums out back are well worth the money spent. I did this on my Duster. Stock discs up front, 11 inch drums out back.