[Jac Mac]

Russell-, Have not used either of these sets myself- would imagine the 'bushed setup ' would be sufficient for your combination. You possibly could use your original setup if the 'new' cam has a similar base circle dia to the old one & as long as you have not gone berserk in decking the block/heads or seating the valves. When using the 'Factory' non adjustable stuff its important to get all the valve stem heights equal plus the block/heads squared so that preload is similar for all the valves due to the shaft rocker setup.Solid spacers as per the setup on Fred WB's rocker shafts is better than original springs & a 'Must Have' for any roller tip rocker.

As Ian pointed out the Rovers have a bit of a reputation for eating lifters/lobes, however if you carry out the lifter bore mod as Russ has done in his build thread ( Dont go overboard on the groove size as in Rover this is also main gallery.), or use 'cool face' orifice lifters along with checking for positive lifter rotation during pre assembly- ensure you have oil pressure primed prior to startup-soft or outer springs only & straight up to 2500 rpm on first start you will have done everything you can to ensure good lifter break-in & life.

Fred WB-, The valve clearance notches on those pistons look a bit suspect- did you verify proper clearance on ALL the valves prior to assy.