Paul,
I hate that no one has given you any suggestions. I see you are in New Jersey.
With a little digging, I came up with two shops that might know of a TR4 for sale - Walker's Automotive in Pleasantville and Eddies Restorations in Elwood.
I am a long time member of the 6Pack Forum from when my son bought his TR6 which ended up living at my house for many years - more later.
On the
6Pack website you will find a couple of cars for sale. What caught my attention was a TR250 project offered by Todd who lives in Ohio. For years, he attended the Mitty races at Road Atlanta with several others from the Ohio area and was always in a unique, but very nicely done car. I think it is a perfect alternative between the 4 and the 6. I have no financial interest in this car and haven't spoken with Todd in years.
If you're interested in a 73 red TR6, my son is selling his car located in State College PA. He has owned it for 18 years.
Good luck on your search!