Rather than a Tee Dee, which, although powerful, is a pain to get to run through the full pattern, buy an AP Wasp .061 from Hobby People (See the thread on the Brodak .061 vs .049 and "Norvel no more" threads about this engine). I have two, and both will drive a 6x2 APC prop over 22K on Powermaster 15% Nitro fuel with added castor oil.
They have a carburetor instead of a CL venturi, but a paperclip to hold the thing open works just fine. The engine likes a lot of fuel to start, but once it is going it is rock solid all the way through the pattern, running suction, not even muffler pressure.
And, it is inexpensive! You will probably pay less than for a used Tee Dee.