Which to keep 1979 Ford Mustang or 2013 VW Jetta TDI Sedan

I have a 1979 Ford Mustang Cobra mildly modified 302, certainly not in perfect shape, and a 2013 VW Jetta TDI sedan (~150k miles), that I bought when I was commuting to work. I have since started working from home. My original thought was to try and sell the Mustang for $5000 to buy a Stage 3 kit for the Jetta that claims 215WHP 370WTQ and some supporting mods.
Pros: Fuel mileage, newer vehicle = more reliable?, seats 5, a lot of convenience features (power locks/windows, seat warmers, better stereo), manual transmission
Cons: Issues selling the Mustang, stressing an engine with so many miles, more expensive maintenance and insurance

My new thought is sell the Jetta for roughly the same price ($4000-4500). Put AC back in the Mustang and build a carbed 347 stroker from the 302 and 8.8 rearend (hopefully find one cheap). Certainly more HP and about the same torque as Jetta with Stage 3.
Pros: Cheaper parts without a lot of electronics to worry about, easier to sell Jetta, more unique vehicle (orange, power locks and hatch release), cheaper insurance, C4 with manual valve body
Cons: Aging car = more things that may need to be replaced/harder to find (very brittle dash shell, inner beltline, door pulls), bad fuel mileage and small fuel tank, seats 4

I do not really race but do enjoy pulling on people from a stop light or leaving them in the dust when tailgating. I know the choice is ultimately mine and the ability to sell one of the said vehicles but wondering what non-biased individuals think.
 
150k miles on a diesel is not "excessive" at all. You shouldn't have to be concerned with the kit if it's from a known, reliable shop and it's for your specific car and engine.

If you go with the build route on the Mustang, are you just going to keep the VW until it's done? You'll need it!
 
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150k miles on a diesel is not "excessive" at all. You shouldn't have to be concerned with the kit if it's from a known, reliable shop and it's for your specific car and engine.

If you go with the build route on the Mustang, are you just going to keep the VW until it's done? You'll need it!

Would need to sell the VW to pay for the build. My wife stays home and home schools the kids and my oldest is almost done with driving hours to get her license, do there are two other cars here most of the time if I needed to go somewhere.

I guess non-biased might have been the wrong word to use. Maybe not emotionally involved is better.