If you have a budget, then build to it. I had some mild head work done to a brand spanking TD42t head on my build. Porting, stellite valves and stronger springs.Is it worth the money. Don't know. As I went from a ZD to TD I had nothing to compare it with. I suppose you need to work out what you want out of the motor. Then kind of design the build from there. No point putting all the biggest and best gear on their only to run it totally stock.

How is Bens motor going Mat? Back up and running?