Turbo head build
If i use the comp 901 valve springs what other suporting parts/mods do i need.
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stronger ( quoting the post ) does not limit lift. Springs with more open - closed pressure can be a contributor to wiping a cam lobe at start up. But those are springs of a much higher capacity than 340 / 901 valve springs.
Even with 318 springs you still want to do things ‘right’ at the initial start up.
1) use a quality moly paste on the cam lobes and at each lifter.
2) lifters turn freely in each bore verified
3) have the motor ready to start, no repeated or lengthy engine cranking prior to start up.
4) run the motor 2000 to 2500 rpm once started. Engine must have the targeted oil pressure.
5) observe that the pushrods are spinning with the engine running,, putting a dot of paint or a paint stripe on each pushrod makes that easy.
with 340 / 901 valve springs you will need the retainers that match up
to those springs. Those springs have a slightly larger OD but still sit in the stock slant head spring pockets.
With your build to conserve money I could go with 318 springs and re use the existing slant retainers and keepers and valves. Do a good visual inspection on the reused parts for wear, those parts are not known to be high mileage failure parts on a slant, but give them a good look over.