if you dont wanna make new driveshafts, measure distance from tranny mount to motor mount to come up with engine location. this should put... wait a minute. you are installing auto and q trac in place of manual and d20,correct? you need to get the quadra trac in the same relative location as it was in the chief so tha you can use those drivehafts. in thacase,id measure from pinion to trans mount from both front and rear axles on the chief,and then use those measurements to get the trans crossmember in the same place,then figure the engine mounts from there. this is assuming that youre using the axles from the chief as well.
hope that helps. if youre planning on custom driveshafts anyway,it probably doesnt really matter where you sit the engine,as long as there is enough room around the fan,and any accessories,etc. theye are probably close enough in weight that it isnt really a concern.
85 grand wagoneer
258/904/twin stick dana 300/dana 44/amc 20
38x15.5 gumbo mudders
snorkel/dual batteries/onboard air/"custom" convertable
3 inch body lift/mostly stock suspension/"modified" fender openings
custom front/rear bumpers and brushgaurd