Because they are sunk costs and can’t be recouped. And obviously we are discussing the Sprint-T again today.
The choice of engine is going to be LS architecture, because I bought parts to install one into the car. I have literally spent hundreds of dollars buying front suspension parts (and I’m using the 4-bar axle brackets to hold the keyboard cleaning goop in the interim). I have a radiator that is built to keep the biggest of racing engines cool so I don’t overheat on the highway or at the race track. There are some bits that were ordered custom and are non-returnable, like the straight front axle, there are some parts that flat out did not fit, like the Garage Sale spindles that were not fully machined and somehow made it through QC.
Anywho, some things can’t be changed unless they are replaced with free stuff, which is why every time Power Nation which used to be Power Block, which used to be part of The Nashville Network around the turn of the century, has an engine giveaway I can use, I enter as much as I can, at least once if that is all that’s allowed, otherwise as many as I can get to the site for. I don’t have an engine, but because of previous purchases I’m limited to pushrod small-block engines so when I read about someone giving away an SBC, SBF, or LS engine I’m right there in line holding my figurative hat. If I thought it would get me the engine I would be standing there holding my actual-factual hat. The parts already purchased that are engine-specific are the radiator hose adapter, and the exhaust header kit, both made to install an LS architecture engine in the car with the other parts I bought. Other parts are engine agnostic, they will have to be used with fabricated brackets, or they literally will bolt to any engine to go into this car.
Back to the initial subject, I’m changing the design bigtime so that I can get in and out of it, but I’m not wiping the slate (boy is that an anachronism). The front end will still be mostly the same as the earlier design, and the parts behind the rear hoop will not change, unless I get several crates full of parts free. Now if you have a parts company that wants however much publicity this vintage blogger can generate for you by using your parts to build a different suspension on the Sprint-T leave a comment or drop me an e-mail and we will chat. But realistically the only thing that’s changing is the design of the rollover structure so I can get out of the car without needing a cherry-picker lift.