As a slow build, long time project "so im not in a hurry" as you say, this kinda make it hard to advise on which way to go as doing things 2 or 3 times happens to happen when ya build over time and a 300kw plan in mind, this won't go with that etc.
premiun $$ plugs.
new leads, dizzy cap and rotor.
extractors, but need to be changed for turbo (what I was getting at cost wise x2).
injectors serviced.
new radiator and hoses.
adjust valves.
auto trans, valve body upgrade and install cooler.
a turbo will want a oil return to sump so if sump come off for any reason then that's the time to have oil return fitted.
choose a turbo in advance and oil return size pipe to suit welded into sump.
insulate, screen, exhaust from inlet and hoses etc.
things get hazy try to plan long term.
lots ya can do, but will redo or change over a long time frame.
and it will cost lots and lots more.
cheers



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