Jamo r Jelly,
The valve springs are next. Unless you are a mechanic and like changing distributor gears and valve springs every 5k to 10k miles or so, you might want to consider a mechanical flat tappet cam.
It will cost you less money than an external
oil pump or dry sump and with the right cam profile we should be able to keep the power loss to around 20 horsepower.
Adjust the valves once a year and forget it.
--Mike