Doing a 4-speed this winter...

Im looking for parts to convert my Duster from 727 to 4-sp... Looking to see if any one has a pedal assy for a 75 Duster, Z-bar, ect... I have a 4-sp trans from a 68 383 gts dart, has about 27K on the trans... been sitting in a car since 78, I will go thru it, It should be good for my Indy engine, small blk 415, probley around 600hp at the flywheel... This OEM 4-sp should hold up in a 3200 pound car...right?? It will see drag strip time about 5-8 times a year, with the 727 the best it ran was 10.71@126... What you all think???? Should I go with the trans I have...(I have a 4-sp trans from a 383 gts dart) Or look for something else.
Thanks....