the double t-chain will bolt right in under the cover no problem

they are used in some stock engines stock anyways

I would suggest the comp 901-16 springs

they drop on with no machine work

use stock retainers

use stock seals

and can be swaped with head on the engine with a cam swap

good up to .500 lift

they will work with all the SB lunati cams

and mybe a few others

just compair the spring rate to the cam manufacture recomendations of spring rate for the cam