I have found these sources have good information on the F 5000 cars produced by Trojan.

http://www.oldracingcars.com/trojan/t101/

plus this excellent book of that era.( " Formula 5000 in Europe" By Wolfgang Klopfe )
Especially the chapter by Paul Rawlinson. (In Google you can read a lot of this on-line )
The front cover has a great picture of Keith Holland in the Trojan T 101 / 1

Enjoy.
(Ken Hyndman )