I have had a moderate oil leak for some time (around 1 QT a month) and know that some is from the distributor gasket that goes bad on these motors (1989 Trooper with 2.8 V6). I recently replaced my A/C compressor and while doing so, I found alot of build up behind it. After cleaning this off mildly, I got some small pieces of rubber that look like its the original rubber bead intake manifold gasket that I have heard frequently fail and leak. This is from the front bottom of the intake between the valve covers where it connects to the block. My question is this-how hard is it to replace the intake manifold gasket myself as a basic DIY? I have never dug into an engine besides replacing simple stuff like alternator and other pulley driven components. I do my own tune ups and basic stuff but this is a pretty big undertaking. I think if I end up doing this, I may want to do some more upgrades while I have it torn apart like the 4.3 TBI upgrade and have the intake machined for better air flow. What others would be recommended while the top of the engine is torn apart and remember my basic knowledge and only working out of a chiltons and haynes since I haven't been able to find a helms for the 89 trooper yet--their site keeps saying sold out. Thanks ahead of time for reading this long rambling post.