Your personal preferance.
They both are sexy cars. The 300ztt, not many have taken it past 6-700hp. But trust me it will survive. Imho, the 300zx tt has the same potential as the mighty 2jzgte supra, built and un-built. I've witnessed it. Im a Supra guy, but worked on a few of these underdogs. The 300z tt's internals are very strong. They actually look a little beefier side by side with the 2j's and Rb26(con rods). The factory pistons have good metallurgy also. I can take some pictures. Also, the high power for a stock block vg30 capability(550+rwhp) is still there like the 2jz. Its just room for bigger turbo(s), oil cooler(s)/intercoolers, and tons of tuning. Either way you go, either can turn out really well.
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