There is no such thing as a 91 on 740, so don't look at any 740s except a 90, but you can easily run a na block without pulling it apart at all, so its still worth getting the latest block you can get. biggest reason is bore wear, even with squirters, the turbo motors end up more worn then the na ones.
13mm rods are the most important detail. All motors with a 90+ manifold came with a 13c afaik. Which i have a stock dp for currently. It will still be easier to get a 240 harness and they don't neeed the speed signal, its just nice if they do.
For the 740t ic, they are ok if you don't want to drag race, they heat soak badly after a run. Its why i went to the effort to get thicker core all alloy units made up.
If you use a stock turbo lh 2.4 computer, with slightly bigger injectors, it will barely notice it.
Ipd turbo cam will do the job for your power goal, but it will need to be adjusted with an adjustable cam gear to make it less peaky from experience.
Flywheel, you won't find a manual 940 or 90 740 to wreck. The dished flywheel runs a bigger clutch but slips sooner due to the dished design. The flat flywheel also weighs 5-8kg less.
