I currently have a JDM L28 motor with F54\P90 head flat piston ...running a su carbs for now..How close i am to have a L28ET..I already have a '75 N42 intake and exhaust manifold..Please help me list down the parts..TIA

I thought all Datsun L6 were JDM (at some point). Too much compression. You won't be able to run any real boost. So start with dished pistons.

I am running 18psi on a f54/p79 via carbs. If you tackle it right it can be done.