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Ride Comfort Considerations

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TR250s are more valuable than a TR4a given the same condition, no issues at this point in early vs later TR 6 cylinder engines as to reliability. Earlier cars are generally more desirable in the TR6 range due to differences in emissions controls and other differences.

Finding a good TR250 is generally the biggest issue.
 
4A vs. TR250, I can speak to that one a little bit. Although a lot of time passed between ownerhip I had a solid axle 4A (roughly a third were sold in the USA without the IRS) and now drive a TR250 I restored.

I know what you mean about the 4A feeling punchy, despite a mild cam, raised compression and a couple other mild tweeks the TR250 doesn't really feel any faster than I remember the 4A, and maybe a tick slower, but on paper the 6 cylinder should be producing a little more power and torque.

The 4 cylnder engine is slightly more robust than the 6 cylinder, which are pretty good, the main issue to look for is the crank thrust washer wear in the six.

They talk about the 6 cylinder being smoother than the 4, but honestly they are both torquey low revving engines and I didn't feel that much difference there.

The 4 gets slightly better MPG.

The 250 has a slightly better top, seals around the windows better.

The 250 has a little more wow value with the racing stripes, 6 cyl. v. 4 and one year only production.

The biggest difference between my cars from a driving standpoint was the chassis. The IRS feels much different than the solid rear. For you this comparison would be more IRS 250 or 4A vs solid axle 4A or TR3. THe solid axle car rides much firmer, bordering on pretty harsh actually. The IRS soaks up bumps pretty well. The IRS puts power down out of tight corners better, but that being said if spirited driving is one of your goals the IRS setup probebly needs more modification than the solid axle. The solid axle is also more rugged and dependable, although you should have no problems with a preperly set up and refurbished IRS setup either.
 
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