Great thanks for the info. I'll look into the heads and go from there. Seemed the only issue is the machine shop aspect and a quick turn around time.

 

I went to AtlanticBritish to look up the Plenum gasket and they don't have it under "Plenum".
Here is the link to the part. It's called the upper intake Gasket I guess. I could have sworn it was called the plenum gasket. Sorry for the confusion- Land Rover Intake Manifold Gasket (Same Fit As Genuine Part # ERR6621) - Land Rover Engine Parts

 

I should have all these parts together in the next few days. Any tutorials avail to replace the o-rings?

On a side note, my brakes have been soft for quite some time. Could a vacuum leak cause these brakes to be soft? Not soft like air, very inconsistent with the amount of bite I get when applying the brakes.