leaks,leaks,leaks........

[moneyeater]

Hello all,
yesterday i took a little spin and cruised around about 20 miles!
Before i started i checked oil and water and all was ok.I noticed a little water in the first valley on the in take behind the heaterport and thought it dropped of the hood because it was wet on the inside. Cleaned that and started the cruise.
after that 20 mile i did a WOT start and at the next trafficlight the idle was very low and the motor allmost died and sounded odd!
I checked for some visible problems but could´t find anything!
The headergaskets were blowing by on both sides where only the passenger one next to the firewall did before and it sounds like the collectorgaskets also blow by! The idling was still very low so i turned idlesetscrew on the carb up a little.
Today i checked and retorqued the headerbolts but they weren´t loose.
While doing that i noticed the passengerside valvecover leaking oil and the water on the intake was there too. Below the carblinkage is oil on the intake
and the radiator misses some water.
The frontlip of the suspensioncrossmember is carrying an oilfilm and the starter is too!
Is it time to pull the engine and replace all the gaskets?
Are there some headergaskets that work better?
I have rubbergaskets for the valvecovers, should i go back to cork?
Where does the water and oil on the intake come from?
Does the engine press it out the thraeds of the screws?
How difficult is it to replace the rear crankshaft seal?

Lot of questions and i hope i can get some helpfull hints and tricks to solve all that leakage!
Volker