Just thinking out loud here but please tell me if it'll work or not.

Not quite sure what the spring ratings are but here goes.

remove front springs and replace with a spare set of rear springs. Maybe add an extra leaf or two if required. I know they're narrower but it should be possible to adapt them to fit. The extra bow should give maybe a couple of inches of lift.

Do a shackle flip on the rear and again maybe add an extra leaf or two if required.

Reason I'm thinking about this is I need to do a lift so the tyres I bought don't foul on full lock so the chevy will pass its annual test over here and nobody I've contacted has as yet replied to my enquiries on shipping costs for lift kits.

simon.