Oh... well that reminds me of something...
One mistake I made and took me a bit of time to realize was... these two cars were too much alike.
I put them together around 2001 or 2002 and before I really had any insight to parts or ideas and this site was in its infancy.
The mistake I made was what I did to ONE car I often did to the other. Maintenance became TWICE the work and the same work for each.
I would have difficulty deciding which one to drive, as they were essentially the same... except for the fact that the POS I bought for a buck (White Fang) ran like a scalded dog once he was tuned and it took a while for me to figure out how to get Black Tooth up to par!
Soooo... what I learned was that if one was a TRACK car and one was a ROAD car they would have two distinct PURPOSES. If ya make them both road cars and one is "better" than the other, then you'll not drive the poorer of the too. It they are both road cars and "equal", then you have a dilemma of which to drive. In my case, if one had A/C
that would have made a big difference!
So I'm just saying... this might become a problem for you also.
I suggest you take the "new" car and do something radically different with it than you did with the first car. Maybe even make it an ORIGINAL MUSEUM PIECE... and never drive it. HA!