New heads/intake/rear end

I've found that I have more cash available than I thought I did. So the budget for this year will include line items for new heads, a new intake and probably a new rear end.

Here's the specs on the motor: http://www.burwoodboysracing.com/about_the_car.htm. I haven't updated that in a while, that cam is out and a Lunati Voodoo 234/242 @ .050 .513/.533 lift cam is in it's place.

I've been drooling over the Indy head package - their aluminum heads, with rockers, shafts, pushrods, intake, etc for a couple of months. Is anybody running that? Would it be that much better than the Edelbrock RPM heads?

The rear I've got now is an 8-1/4 with 3.91 gears. I'd like to put in a rear that is basically bulletproof, so I'm guessing that means a Dana 60 or a Strange D60. A friend of mine, who's known locally for building rock-solid rears offered to build me an 8.8 for around $1500 (includes everything but brakes).

Make some suggestions here people... heads, intake, rear. Keep in mind that I'm cheap so I'm looking for the best bang for my buck.