I'll tell you what I did with my engines. I sold on eBay a NIB Mega Picco ZX-12 for $180 [Incluiding the Palmaris conrod] just to buy a OS TZ. The thing bout engines [if you arent a sponsored driver] is that you have to think long term. The OS TZ you can get for $185 and rebuild internals for less than $100. I stopped using my RB V12 Rody when I found out how much it would cost me to buy a p/s/conrod.

So yes, try to sell your RB V12 Rody. If its in good condition, it could sell for more than you need to buy a OS TZ. The pipe, I would recommend to use the Skyline VR12. Its one of the cheapest pipes out there [$60 and $40 for just the pipe] and still gives some sick power throughout the whole power band.