I dont know if it helps or not but my 86 buick t type has 3.42s a 2004r with lu(3,200 stall) and 26 inch tires and at 78 it runs at 2,350 rpm.I have no problem with cruise pickup,it only takes a second for the turbo to spool up.And i would have way less torque than you do.Even with 28 inch tall tires no pickup problems either.