The degrees of the cams mean nothing its how much lift is there and the timing of the cam. If you are running after market turbo pistons you shouldn't have a problem.
My 1.5jz build was a PITA, but got there in the end 5 times.
You need to double check you head gasket thickness as well.
When it comes to you running low range, there shouldn't be any issues as long as you have a decent radiator and a good oil cooler (might even look at a thermo for it as well) keep in mind jz engines do run hotter than normal anyway.
Also what other mods have you got or do you plan on putting on is turbo choice etc will play a big part in everything as well
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