looks good. if your machinist balances/blueprints everything you will have a very fast car, 10's easy.
suggestions:
i've heard doing reverse manual etc in a 727 is not a good idea. a strong HD built 727 and a shift improver kit... some things are good some not so good. most everyone who goes to cope racing for 727 trans work comes away happy.
http://coperacingtrans.com/
you should call them before you spend money on trans work/parts. avoid some of the off-the-shelf 727 builds you can buy at jegs/summit (TCI etc) i've heard horror stories about the quality and durability. just call cope. hear what they have to say.