Disappointed in my 383 on the Dyno

i thought the 440 would be an issue with things like the heater blower motor, and other items. Plus, i can not find a 440 block for less than a grand. I was also looking at 400 bottom ends but i figure since the car is going to sit over the winter and the trans is being torn down anyway.... yea lots of things to consider.... i do know one of my salesmen who builds race hemis is willing to essentially build the engine for almost nothing to help me out makes this decision easier.
I would think the 440 would be pretty much in the same configuration as a 383 but I'm not positive on that...
I'm not a big fan of an aluminum case on a 4-speed with the kind of horsepower and torque your talking about..