Motorcycle Questions? Ask a Mechanic.
I'm not completely sure what your question is but I can offer the following.
With an 88 cubic inch RevTech engine that has compression releases installed you can run any starter down to a stock 1.4 kw. The reduction in compression afforded by the releases drops cylinder pressures to below stock.
The 2.4 you've ordered is more than strong enough to spin your engine. The post orientation is completely dependent on the bike that the drivetrain is installed in. The side post is most common and will likely be fine. To be sure that the starter runs at is maximum potential and does not overheat you'll want to be sure to use heavy gauge cables and a high quality battery producing greater than 300 CCA. Small cables and/or a weak battery will cause that large of a starter motor to overheat and reduce the life of it.
I hope this helps, thanks, P.J.
Those should work just fine. Make sure the ground goes directly to the rear starter mounting bolt and not just to the frame of the bike. That ground connection is absolutely necessary and often overlooked.
Best of luck. Thanks, P.J.