On a stick bottom end too. Cheap and easy :).
The 3076 would be a good option with a .6 or .7 rear that should net your 300 and be fairly drive able on road.
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dont underestimate a na rb30 bottom end mate
This should answer most of your questions mate, you could watch the full clip or just forward to the 5:50 min mark http://youtu.be/TcnEz8Eru7U
Thanx for the vid alitis007 that def was helpful but how loose is that dude hahaha
Im not, but they do have limitatons like everything. Wanting to keep a rb reliable with a stock bottom end I wouldn't be exceeding 400hp at the treads.
An RB30 in a patrol has a lot more strain on it than that of one in a skyline or VL. Larger tyres, much larger diffs and drive train losses and about 1 tonne of extra weight to push around.
The OP goals are realisitic goal (at 300hp) and will be a very usable figure for a patrol. Research is key here though as the setup will be a little different to that of a street car. A build like this should be well thought out and built accordingly. There is a vast difference between something that is built and something that has just got bolt on add ons. Im not claiming to know a lot about these motors but time taken now will see you very satisfied.
There was an article on a rb30 GQ in a 4wd action mag about 2 years ago. Sorry I can't remember much other than it was black lol. It may have had a big "mannel motors" sticker down the side. It ran two computers so could be switched between full power or a bit more economy mode. It had something like 220kw at the wheels on 37s........