Nice build. As far pistons. Use early OBD-1 pistons, they are fully dish, don't use the later ones with squish area. Dish has less of tapping the valves with 16v setup at higher rpm The other route is rebush the rods to fit 2.0 16v pistons. 8v dish pistons will yield around 8.5 cr, and rebush 16v pistons will yield 9:3 cr. Use aba head gasket bc it's all metal. You should use 16v intermite shaft with 16v oil pump setup. Less hassle buying and modify stuff there. You might need bigger injectors if trying reach 300whp. More like 42# injectors. Nice build again.