I am not sure why you want to go on a dyno - do you want to know how much power your engine puts out or do you think it is not running right? It is probably turning out a little less than it left the factory with!
If your 33 engine is standard I wouldn't bother with the rolling road. Setting up the float heights, checking the jetting is as it left the factory, balancing the carbs and getting the timing and advance right would be more important. All these can be done yourself with a small investment in tools (and is quite satisfying too). I have had 4 rolling road set-ups (one on my old alfasud and 3 on the Bertone) none gave any improvements to mpg, power or drivability. Now on my bertone I run with the standard jetting but a modified distributor - all set up by myself of course.
stock set up, factory settings etc etc are always a manufacturers compromise of longevity, relaibility and all round driveability,
in other words they work reasonably well in virtually all scenarios for a reasonable amount of time without wandering or suffering any ill.
i would consider a dyno session invaluable for improving on those compromises towards whatever bias i had personally, i.e. performance, economy, driveability so on and so on
this chap doesn't come across as a power hungry bar boaster, but does want to know that his engine is performing well, safely, and if at all possible, can it run a little better?
a carburation change in jetting, ignition advance settings, etc etc, all subtle enough but can come together to make quite a difference
if you have had 4 previous dyno sessions that have not provided you with any of the above, you have been to the wrong dyno operator in my opinion,