I have the contemporary road tests from Motor Cycle Weekly but as they aren`t in date order (more or less all copies from `68-`83) it would be the best part of an hours work to find them,so I`m not bothering.
However,going by memory ,and best one-way speeds,which is what wer`e really interested in,is as follows...
3C.......not tested
3CE.....(not strictly a factory model but showroom available)......138.9 mph
Jarama...(3CL with left hand change and reflectors for the USA)).....127 point something mph
Jota....(as 3CE)...140.04 mph
1200....132 point something mph
1200 Mirage...133 point something mph
This is just one magazines results,but obtained at MIRA test track`s timing lights under as consistent conditions as possible.
MCW had folded by `83 so not so sure about RGS/A , but Bike magazine got a best of 123 mph from a RGA.
Real advantage of Mirage over 1200 was a standing start quarter mile in the low 12 second bracket and higher terminal ,although I think the Jarama managed 12.8.
Hope this helps.
I forgot the 120 degree Jota tested in `82 which gave a best one way of 142 exactly.
And the 1200 TS Mirage (Big valve head but standard cams and Lafranconi silencers I think,as tested,but other options were available,,I may be wrong) which gave a one way top speed slightly higher than the standard 1200 at about 136mph.
So from all that I guess you could expect a best top speed in the high 120`s for a standard 3CL and low 130`s for a standard 1200 (standard cams but not A12`s,and Lafranconi mufflers),and these being timing light speeds,not ND speedo readings.
And I think early 3C`s were fast too,although I`m not sure if any accurate timed data exists for these?
Also,If I remember,when the Jarama was first tested results were disappointing,Jaramas intended for the USA but remained unsold were redirected to the UK,these being the ones fitted with the left hand change conversion,and were sold by Slaters at a reasonable £2 grand or thereabouts with a Bell Star helmet thrown in if you bought one,but when the MCW test bike would barely top 120 mph it was found it was incorrectly fitted with French/Swiss A12`s,with correct A11`s fitted performance was restored.