u need a lot of money for big hp in a beetle....aircooled way. say, 40-50K. even that, u will still need extra for spare parts in case of broken stuff.
new case US 400-650
crankshaft US400 big dtroke forged
rods H beam US300
camshaft US100
lifters US 80-US450
pistons US200 to US2000....yes US2000!! for pistons
studs US 60
heads US700 - US3000 depending on your application
rockers US 400 - US700 depending on brand, lift, material, quality
clutch - US 80 - US 300
full flow filter set US150 plus additional for washable filter used in drag cars....eg Oberg or System 1
Carburators - US 1000 plus extra cash for jetting, spares
MSD ignition US 600 for full set OR
EFI fuel n ignition - programmable ...can get from Sunway shops Microtech,haltech but u need to buy throttle bodies yourself.
that will give you about 200 bhp if done correctly.
if u want cheaper options, u can go for Japanese engine conversion, Subaru, RX7...muh cheaper and feasible for us malaysians. turbo is good....a few running already.
but then, u will stilla lot of mony forthe gearbox.
Quaiffe LSD is about 1000 pounds i think depending on type of box.