Power-band from 2800, but will it pull away from a level stop decently at less?
We're only guessing but I doubt there'd be a problem.
My tame crossflow had a mountain more torque that the original 1470cc engine.
I do not want to put the battery up front again.
Lots of people mount the battery in the space forward of the tail light.
Looking at them I do not see an obvious reason to not just put the top side down for boring?
I'd wait till your pistons arrive before boring the sleeves. No point risking doing it twice.
I'd have thought for the cost of the boring job ($400), you could probably get a set of new liners.
Was there an offer of liners with your new pistons? They're usually available as a matched set.
Machine shops are often wary of boring wet liners and particularly if they're to be done without being installed in the block with a strain plate, which is fair enough.
Apparently, the motorcycle guys are more confident doing single liners as one might expect, though I've not been down that road.