send your engine to bavarian auto recyclers or korman and have them do a performance rebuild. i will assume new valve lifters will be part of the package, as they are only 12 bucks a piece.
go for iridium spark plugs and high power ignition coils.
if you want the best, have the pistons thermal barrier coated, and if clearances allow, tungsten disulfide coated on the sides and piston rings.
also coat any sprockets in tungsten disulfide, and the valves thermal barrier coated.
if the service history has nothing about the fuel pump in there, get a new one, as they tend to fail suddenly, especially with low sulfur fuels.
you can have your oil pump rebuilt at vac motorsports or even get a $5000 stage 3 cylinder head with all new valves and stuff. i guess it all depends on how much you want to spend, be it a few hundred to replace the obviously worn parts, or many thousand to have the engine back to new or to a whole new level.
Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue