I ran a steel chevy crank in my BGF. It held up just fine and I still have it today. Do not skimp on pistons what ever you do. I would use a steel rod also for what you are doing. I'm a Carrillo freak but you could get by with Manley or Eagles.
If you take BUSBY's advice on the Clay Smith cam (they also make a great fuel pump) I might be able to help you out on that.
You might be able to pull it off if you really shop around and pick up a used 6 or 8-71 for a good deal. (I always seem to come in around double your budget myself) Just make sure the blower is set up for gas and not alki.
Hey BUSBY, have you priced out a couple of dominators lately? Carbs, carb adapter, scoop, throttle linkage and spark arresters will add up to more then a brand new Bird & pump! I know, I know, just don't seem right to me either.