Hello Jim,
From what I can gather, real equivalency to a good 049 like the Norvel will require about 190 to 200 Watts from the battery. That's based on just under 1/4 horsepower. We will probably benefit from somewhat bigger prop sizes, but you will almost certainly need over 150 Watts to fly the same models well. That works out to maybe 17 Amps on a 3-cell pack. The park 370/1080 is rated at 110 W, and I'll bet you could push it to 125W. Build light and start out with relatively short line lengths until you get the available power sorted out. You'll probably get about 10,000 RPM out of the motor loaded dowmn, so you can figure out what pitch you'll need based on the lines.
That's the best I've got, short of recommending that you read the excellent stuff that Dick Sarpolus has written on smal E-Stunt in both Flying Models and Model Aviation.
best of luck,
Dean