[GTX JOHN]

Bill: The 8 1/4 lasted several years in our 11/12 Second stockers in the
70s. They are lighter and a bit faster. Gear supplies dried up in the
80's with the deepest gear available 4.50. and no 4.80 to be found anywhere.

The slant 6 should be fine unless you re using transbrake and 7 inch convertor.