Use genuine rubber hoses, the silicone ones are very cheap and are fine for intercooler and intake piping but often get pin hole leaks when you use them for coolant. When I had my engine out the block was acid dipped then bored 40thou, honed and decked then sprayed black. All new welsh plugs and every hose in the engine bay with a new genuine part (coolant, fuel, vac and blow by), had the sump (acid dipped), head rebuilt and cleaned and the intake manifold. Then replaced all the bolts and studs on the engine with new genuine ones, new coil pack cover, polished the rocker covers like a mirror (paint flakes or chips of easy) and added an alloy radiator and extractors heat wrapped. I made it look good as new with the exception of the alloy parts, a pod filter and extractors. That's as good as its going to get with a N/A