Valve spring removal and PB Booster is in the way

You can make your own spring remover using a factory rocker. With an angle grinder & cut off wheel, grind out the pad section that contacts the valve tip. Spread the remaining 'arms' slightly so that you can access the keepers. Weld a piece of pipe or bar about 10" long onto the p'rod onto the top of the prod cup area. Mount to the shaft & pull on the bar to compress the spring.
Make sure the piston is at/near the top of the bore in case the valve drops slightly. Get a screwdriver with about a 4" shaft, bend the shaft slightly; put that in the spark plug hole, screwdriver tip touching the valve to hold it place. Lost count of how many springs I have removed using this method....