1.6 will allow better selection of props to choose from and smaller size. 1.75's causes big props and a better hole shot in theory. But the props cut down on the 1.75 advantage. 1.6's let you run average 26/27 props that are more avaliable to try or borrow rather then having to buy and modify and test then sell and do again.

The tq master will need coned and should be faster than the sporty after modified. I would prolly
Let Titus or tooter do the modification as they have the experience with bullets, strokers and allisons. I think their work is superior to all others.