I found a coupon and did get the HF 1/4" torque wrench. Nice little unit in a hard case. Gotta really listen and feel for click. Got carbon cleaned out of head. Sprayed head gasket with 4 light coats of Copper Gasket Maker (~$9 at NAPA). Torqued it per the manual steps. Runs great now - no smoke and good power.
Now, on tuning carb mix screw....Go IN (CW) until it runs rough and then back out 1/8 turn or so? Currently, I have good power and no smoke but only 10 mins WOT run time.
Thanks so much.