Thanks for the reply. Sorry, I meant too small haha, wrote it in a bit of a rush. Definitely will look into the books you've linked, and when the times comes speak with Datsun Spirit about the pistons, as that was my main question/concern.
For the whole build itself, I basically want to strip down the car down completely, get the body cleaned up and repainted; and work from the ground up. Keeping the originality of the car by sticking with the original N/A L24, but bringing it more up to date with an EFI setup if it's a possibility, or ITB's if not. I want to install more modern, stronger and lighter components such as pistons, connecting rods, valves and a lighter flywheel. Make the engine as light and free revving as "possible." Somewhere in the region of ~250hp, maybe ~300NM of torque, still deciding on power and torque.
For the rest of the car, I'd like to strengthen the chassis, and more or less update all the suspension components. Full coil over setup, front and rear lower control arms, moustache bar, axles, bushing etc; Wider, front and rear track, tyres and wheels. There's a lot I want to do to the car, and lots that will need to be done so I won't drone on.
I basically just want to bring the car more up to date or modernise it you could say. Clean it up, update it, but keep as much of the originality of the car as I can. It will be used as a weekend car and will see track use.
As for other ideas I've had, they're more aimed towards the chassis and interior side of things rather than mechanical haha! Hope you have a slightly better idea where I'm going with my car. It probably sounds mad, but I'm determined to stick to my build haha!
Thanks again for the information and links, it's much appreciated!