CaliZCar

Hello all! This is actually my first forum post, as I have been lurking quite a bit. Please let me know if I have posted this in the wrong place. I am currently in the midst of a 240z restomod, with a remarkably clean shell out in the yard. I have solidifed the plan to put a RB25DET in it in the foreseeable future, as the charm of the RB engines has quite a hold on me Now the kicker is, I'm on a tight budget, being in high school and soon college. I want to begin to build the car and get the internals working before I drive it over to a paint shop to get a nice finish (it is currently primered). My initial thought was to go with the RB right off the bat, however this would result in the car being off the road and in the shop for much longer than I can stand, as well as be a huge task for a newbie mechanic. My current thought is to purchase a good ol' L28 and a 5 speed tranny for use until the car looks and moves how I want, then RB later when money is not as tight. Another reason is that I love the feel of the L series with a passion and want to get to know the engine before moving to bigger and better things. Is this a reasonable plan or will I sink too much money into an engine I plan to replace anyways for it to be worth it?