also somewhat dependant on your mileage.
sr's usually come with a certain amount of mileage that is likely to be lower than the mileage on your ka24de. although mileage does NOT make a difference since i know a few ka's over 100k+ miles that still hold compression and run very well. its just a matter of preference on the mileage part.

after i finish suspension/braking upgrades, i plan on picking up a spare ka24de block. i cant divulge my specific plans, but if the number 400+ means anything to you, you might know what i plan on doing.