Thanks very much for the advice guys, I have read through the 65 page thread on the GP super stearman and chose those engines based on comments taken from there.  However, the power hungry ignition at almost 2A draw has me concerned, so I may have to re-think gas engine choice.  I saw some nice pic's of a DLE 30 installed, but thought the Zenoah was a better engine. I am so confused...
I would like to buy the Saito FG-30, but my budget is limited.