What to do?

Here's the deal.

At the end of last season, I found a lot of coolant in my oil. I think one (or maybe both) of my heads are cracked. They're X heads that have been milled quite a bit. Either there's a crack in one of the heads or the intake gaskets failed. Or maybe the intake just doesn't fit properly. I bought a pair of Mr. Gasket ultra-seal intake gaskets to put on the car now and found that I had to trim the bottom of the gaskets to make them fit properly. Maybe that'll fix it, I don't know.

The next problem is that one side's axle tube in the rear (an 8-1/4) is starting to twist. That side is leaking a little bit where the tube goes into the center section. Aside from that the rear is in good shape, no noise or anything.

The final problem is that I'll only have around $1500 to spend on the car. I wanted to get a set of Edelbrock heads, but now I'm thinking that I should probably replace the rear. I'd like to go with an 8-3/4, 9" or Dana... A new D60 from Strange is appealing, but too expensive. An 8-3/4 is hard to find in these parts. I guess I'd need a new driveshaft as well...

So what to do? E-heads and run the risk of blowing up the rear sometime this year? Or fix the rear and hope the new intake gaskets fix the problem? Or spend my days changing the oil and replacing intake gaskets?