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As far as I know TD42 and TD42T used the same engine block and head. The only difference being a few extra holes were drilled and tapped to get oil and water feeds for the turbo model. GQ silver top (silver rocker cover) had heavier pistons than the later GU black top engines. Unless you plan to turn the boost right up to go racing you won't have any problems with your black top engine. They are still good for significantly more power than standard with complete reliabillity.
I suggest you fit boost and pyro (exhaust temp) gauges ASAP if you don't already have them. These 2 guages will tell you a lot about what your engine is doing and how well it is tuned.
I agree with Dogman (also Wayne) that the best thing you can do is join a 4WD club and do their driver training course.
Your idea to do most of the work on the car yourself is excellent, not only will you save a lot of money but you will learn a lot about your car at the same time. If you get stuck or if there is any thing you are not sure about, just jump on here and ask any questions you want.
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