[SCOTI]

My dually is not an apples to apples comparison but it could provide some insight.

I'm using basically the same OD front tire size @ 29". My truck has a 1.5" pancaked front x-member, 3" spindles, bags, PB's 1" forward lower a-arms, & Slosh Tubs. With my front x-member and un-modified/taller frame rails @ the front cab mounts flat on the ground, there is barely any clearance @ the factory A/C blower motor. I mean less than1/4" clearance....

If the stock HVAC set-up is removed, I would think you would be fine just airing out given it's depth & the fact that your wheel base should be pushed forward more w/a Dropmember. Cruising @ a super low height might be 'iffy' once the wheels are turned though.