Sooner or later everyone goes SR or KA-T or RB I don’t know too many people that keapt a KA for many years, and true some people don’t rebuilt a KA when they go KA-t but the wise ones do, depending on the amount of KM’s on the engine that is.
Not too many people do these upgrades right away and neither did I. I bought my SR and I let the engine sit in my garage for over a year before I installed it because I wanted to save up enough money to do the upgrades during the installetion. I figured it’s cheaper to get everything done at once instead of going with a stock set up and then going back for the upgrades later.
It’s less labour time because it’s eisier to work on the engine while it’s out of the car.
Everyone does their own thing but like I said sooner or later everyone will do something.