any guesses at E.T and HP?

Depending on your converter performance, hook, and other variables, i'll say......

Just either side of 7.00 @ 97-100......since it sounds like the first passes with this combo.

P.S. The gear/tire dia looks pretty good. Should cross the stripe in the 5500/5700 range. You may be leaving a little on the table with the 1 5/8" primaries though?

P.S.S. Removed my above numbers...... I must not have had enough coffee when I typed them....lol.