The thing you've got to look at here oli is the type of use your engine is going o be getting.. Road engines won't always be on the limit with high down shifts etc.
I'd have a good dynamic balance done with some arp's holding it all together. Get a much weight as you can put of the rolling mass.
I'd also look at the valve trian, a set of double valve springs (vauxhall 16v ones fit well
. is a must and larger push rods too (ford pre cross flow are a good fit) also enlarge the holes in the head..
Under piston spray is a definate winner also.. Along with a baffled sump Or of money isn't really an object then dry sump it.. I don't know what the standard oil pump is safe to rev to, but I bet 7k is almost its limit.
You also want good quality bearings.
Cam.. I'd go for a custom jobby that gives a nice torque curve as opposed to max power.. Something like the piper 270... With a little overlap as possible..
Some good head work and bigger exhaust valves.. I'd just port match the inlet and open out the exhaust..
It's worth also adding an extra breather to the block too, the old mechanical fuel pump blanking plate is a good place (just make sure you baffle it)
I'd also up the comp ratio too since your on efi, maybe as high as 8.5:1 to 9:1..
Forged pistons is a must imo too.. Also some total seal rings.
I never really had any failures with the efi but by then very thing was uprated including the liners. With the carb I only ever split one liner, but that was running gas at the time so cylinder pressures would of been massively high