Always do springs when rebuilding. They are cheap in the scheme of things and your old ones have gone up and down literally millions of times by now and almost certainly lost pressure at peak lift. There are no aftermarket oil pumps for VG however the factory pump can be modified to increase pressure and reinforced with aftermarket parts to reduce flexing from the crank moving fore and aft. Rebuild and forged parts will not necessarily add HP however I suspect your interest lies in the longevity of the motor...
Have a chat to the guys at JH Southcotts - Richmond for a little extra help with parts and ideas. Whilst old school guys theyre very good with their craft. Old workplace uses then regularly and I had a suby engine done by them. Top notch work first time too.
